Fish that do not need oxygen in the aquarium


What aquarium fish live without oxygen and air

At first, I would like to make a reservation right away. All life on earth can not live without oxygen, or rather without air. Therefore aquarium fish that live without oxygen simply do not exist, there are only fish that, with the help of special organs (gill labyrinth or intestinal respiration), can breathe atmospheric air, and not oxygen dissolved in water.

And so, the fish breathe oxygen, which is contained in the water. This happens with the help of a special organ of respiration - the gills, which in turn come in various shapes. As a rule, the gill slits are located on the sides (about 4-5 pairs of gill lobes). The water washing and passing through the gills gives up the oxygen dissolved in it and carries away the carbon dioxide that has been emitted. Next, the "extracted" oxygen is spread throughout the body of the fish.

However, some species of aquarium fish can breathe skin or take in air into the cavity of a floating bladder. In addition, there is the so-called intestinal breathing, which is possessed by aquarium catfish (speckled catfish corridoratus) and loachworms, which can get air into the intestine with the help of the anus. I think that all those who have speckled catfish have seen how they rise from the bottom of the torpedo to the surface of the water and back - this is exactly the same thing - intestinal breathing!

And now we are getting to the question that interests us! Some species of fish have special organs with which oxygen is absorbed. One of these organs is the gill labyrinth, whose owners are classified as LABYRINTH FAMILIES. A labyrinth is a specialized respiratory organ that allows you to absorb oxygen directly from the air. Labyrinth fish take the air by "swallowing" it from the surface of the water. Therefore, such aquarium fish aeration is not needed! However, if access to the surface of the water is closed, such a fish will soon die.

What kind of labyrinth fish can live without oxygen, here they are:

Cock, Betta or Boytsovskaya fish

This is all GURAMI

(blue, marble, kissing, honey)



Photos of fish that live without oxygen and air

11.10.2013 added

In Asia, a lot of rice fields and it is there that live fish adapted to breathing atmospheric air. These are, in particular, labyrinths that have a labyrinth labyrinth organ (labyrinth). It consists of winding canals, the walls of which are formed by bone plates covered with films with blood vessels. Contract labyrinth enters the perch-shaped detachment.
The labyrinth organ makes it possible to survive in water, where there is practically no oxygen. Moreover, if labyrinth fish interfere with breathing air, it will die even in oxygen-saturated water. Therefore, keeping such fish in an aquarium, it is necessary to ensure that floating plants do not completely cover the surface of the water. And there is also the African labyrinth fish - Ktenopoma.
a selection of photos of fish that do not need oxygen

Fish that can survive without oxygen in the aquarium

It's no secret that oxygen is present in the aquarium in a dissolved form. Fish constantly consume O2 and emit carbon dioxide. When an aquarium is artificially highlighted, the fauna highlights it during photosynthesis. To ensure a comfortable life for the fish without additional aeration, it is necessary to choose the right plants and settle the optimal number of inhabitants.

The most common problem is considered an imbalance in the number of green spaces and fauna. In the event that plants are not able to cope with providing all residents with oxygen, aquarists are forced to resort to using special devices for aeration.

The presence of oxygen in water is the main criterion for the life of almost all aquatic organisms. Aquarium fish are demanding on the saturation of water O2. This indicator can be called one of the main in determining the chemical composition. Oxygen is essential for both fish and other creatures and plants. Each type of underwater inhabitants has its own requirements for aqua saturation. Some of them easily carry oxygen-poor water, others are sensitive to minor fluctuations. Few people know that an excess of oxygen can also have a detrimental effect on fish. How to determine the optimal indicator? If there is not enough oxygen, the growth of the fish slows down. This is primarily due to the wrong process of assimilation of food. Creating an ideal ecosystem, consider that in addition to fish, oxygen is consumed by other organisms from the aquarium: ciliates, intestinal cavities, mollusks, crustaceans, and even plants in the dark period. It is not difficult to guess that the more inhabitants, the more oxygen they consume.

It happens that the wrong organization leads to the death of the fish. In the process of oxygen deficiency, fish begin to choke due to accumulated carbon dioxide.

Causes of oxygen deficiency:

  • High density of inhabitants;
  • High salinity and temperature of aqua;
  • The consequences of improper treatment;
  • Alkalinity jump.

As a result of the increase in the thermometer, the processes occurring in the body of the fish are intensified. This leads to an increase in oxygen consumption. If the figures have crossed the mark of 28 degrees, then the fish begin to consume more O2 and emit a large amount of carbon dioxide, which leads to starvation and, if it is not urgent to react, then to the death of pets.

Lack of oxygen in a polluted aquarium is also dangerous. Various oxidation processes will occur in it, which will have a negative effect. It is very important to monitor compliance with the number of tailings and water quality. Try to provide pets with high-quality filtration.

It is worth saying about bacteria, which are an integral part of the underwater world. The increase in the number of inhabitants leads to a large amount of excrement, which leads to an increase in the ammonia content of the water. All wastes that are subject to mineralization are carefully treated with bacteria. Thus, the more organic elements, the more bacteria that also need oxygen. As a result, the circle closes. If bacteria and fungi are O2 deficient, then they begin to more slowly cope with the goal. Return balance in the ecosystem, you can only increase the supply of oxygen.

But there is another side to the coin. Thus, high oxygen saturation leads to an increase in pH. This situation is not welcome in the aquarium, because the difference in the water being replaced will be too global.

Pay special attention to the flora of your aquarium. Because plants are an amazing and very important part of creating the right microsphere. All plants produce oxygen during the day, but consume it at night! It is necessary to take into account and do not turn off the aerator at night.

What fish can survive without oxygen

On the Internet, more and more people are trying to find the answer to the question, what fish can live without air? However, the answer does not quite suit them. Find at least one living creature that does without oxygen is impossible. But there are some aquatic inhabitants who can survive without a system of aeration of water.

The difference between fish is that some of them calmly carry scant water and can breathe atmospheric gas. Due to their ability, they are considered the most enduring and unpretentious in the care. There are several types of such inhabitants, but, unfortunately, not all managed to adapt to aquarium life:

  • Aquarium catfish or loaches. These fish use intestinal respiration with atmospheric air. It happens quite simply. Catfish rises to the surface, swallows air and sinks to the bottom.
  • Labyrinth. They received their name because of the unique breathing apparatus, which is also called the gill labyrinth. The process of air absorption is similar to the previous option. The most popular aquarium representatives are: cockerels, gourami, lyaliumy, macropods.

However, one should not expect that these animals can live completely without air. They need it, therefore, in no case should one block access to the air from above.

Signs of lack of oxygen:

  • Fish rise to the upper layers;
  • After a couple of hours, the fish bulge the gills;
  • Decreased appetite;
  • The immune system suffers;
  • Growth slows down or death occurs in 2-4 days.

Death may not occur, but the fish experience constant discomfort and all life processes are slower, which affects the growth, color and behavior of the animal.

Thus, the fish can not live completely without oxygen, however, you can make your life easier by buying inhabitants who can breathe atmospheric air. But even with a small selection, you can gather the best representatives and create a unique reservoir where you can live, and at the same time not experience discomfort, fish and catfish.

Unpretentious aquarium fish

Caring for aquarium fish - the whole science. At first glance, it is impossible to remember all the conditions and requirements for the content, it is difficult to find the means to purchase a huge aquarium and expensive equipment for it and time to prepare special feeds and regularly test the water. But there are fish that will forgive the newcomer for his inexperience and possible mistakes, and caring for them will not require huge material and temporary resources from him. About these simple to care, tenacious and unpretentious inhabitants of the aquarium and will be discussed.

Viviparous fish

They are considered the most undemanding to the conditions of detention and, in the general opinion, are the best option among aquarium fish for beginners. In turn, among this group there are also champions in vitality. Of course, this is a guppy. These fish are familiar to all, they were popular even in those prehistoric times when the filter, compressor and thermostat in the aquarium were considered a luxury. And the guppies in these aquariums lived, sparkled with their magnificent tails and multiplied.

Small fishes of this species can live in a small amount of water, without filtration and aeration, at different temperatures, exclusively on dry food. Of course, such a life cannot be called a comfortable life, and this may soon manifest itself in a deterioration in the appetite of small fishes and paling of their colors. Therefore, it is still very desirable to install a filter in the aquarium, carry out water changes regularly (once a week at 20-30%), and try to diversify the food as much as possible.

Another condition for a long and happy life of gops is that there must be a few of them in the aquarium, not less than 5-6 pieces, since they are packaged and feel alone and uncomfortable.

Relatives of guppies, equally popular in novice aquariums, are swordtails. These small bright fish also do not require special care. They are larger than guppies, so they need at least 40-50 liters of an aquarium; about 6 liters of water should be consumed per individual. Otherwise, the fish is also unpretentious, tolerates non-ideal conditions in the aquarium, organic water pollution or high nitrate content in it, and even breeds under these conditions.

Petilles and mollies are also viviparous fishes, almost as good as guppies and swordtails in their resilience. They need a more constant water temperature. Here, perhaps, all the difference.

The colors and forms of viviparous fish are so bright and diverse that you can create a beautiful, lively and interesting aquarium, using only representatives of these species. And the ease of their reproduction at home (fry are born already well-formed, they eat adult food themselves, and for their successful development it is necessary to ensure only the presence of thickets of small-leaved plants, you can even artificial, where they can hide) and allows even the beginner Aquarist feel like a true fish farmer.

It should be noted that at present breeders have deduced a large number of different forms of viviparous fish - with unusual colors, veil fins, and so on. These fish are unusually beautiful, but they are much more demanding of conditions of detention and not always suitable for inexperienced owners.


Carp representatives are the next most popular among beginners and ability to survive in difficult conditions.

In this group, in the first place, it should be noted danio rerio. This fish, it seems, takes nothing. In my aquarium, my friends once broke the thermostat, in the very heated water all the fish died and only the danios continued to swim as if nothing had happened. These persistent kids even launched into space.

Danio have quite ordinary appearance, but they captivate with their activity and swiftness. The schooling fish, but does not require a lot of space, 8-10 individuals will be perfectly able to live in a twenty-liter aquarium.

It is also quite easy to propagate them - it is enough to set a female (2) and three males ready for spawning into a small container, put them near the window early in the morning so that the first rays of the morning sun hit the bank and the fish begin to actively spawn. Growing fry, of course, more difficult than that of viviparous fish, but with due diligence and it is quite possible.

Another frequent inhabitant of small aquariums is the cardinal. This is a small-sized, up to 4--5 cm long, slender and mobile fish with bright fins. Cardinals are undemanding to the parameters of water, have a peaceful and livable nature, use dry or live food. A flock of nondescript at first glance cardinals will liven up any aquarium.

Barbus are also representatives of carp. In aquariums there are many species of this genus, the most unpretentious of them is considered to be a Sumatran barbus.

He has a bright golden-black striped color, and indeed in the aquarium it is difficult not to notice, his character is too active. Because of this, the bar should not be settled in an aquarium with calm phlegmatic fish, they will be uncomfortable with this jumping bully. Barbs are prone to obesity, so you should not overfeed them. Another possible problem in fish of this species is the stagnation of calf in females. To avoid this, you need to raise the temperature in the aquarium twice a year, stimulating spawning.


Labyrinth fish, perhaps the largest and most elegant of those who can advise a novice for a small aquarium. Macropods reach a length of 9 cm, males - 6 cm (plus luxurious fins of almost the same length), and at the same time they can live in a three-liter jar without aeration, if only there is space between the surface of the water and the lid.

These fish have a special organ - a labyrinth, which allows them to breathe atmospheric air, so they feel good in oxygen-poor water, and other water parameters (temperature, hardness, pollution degree) are not too demanding either.

They have a very good regeneration ability, they can quickly restore damaged fins. Their disadvantage is an aggressive, fighting character: the males are completely intolerant of the males of their own species, and in some cases they can attack other species of fish, especially the macropods. Other labyrinth fish - liliusi, gourami - have a more peaceful disposition (although sometimes gourami, guarding the nest, can survive from a small aquarium of their neighbors), but are somewhat inferior to macropods and cockerels by simplicity. They, especially breeding forms, require a constant temperature in the aquarium, clean water, the presence of thickets of living plants.


These include such popular species as ternets, neons, various tetras: copper, firefly, rhodostomus. Small, very charming schooling fish with interesting colors, red and golden spots, glowing neon stripes. In ternation, the color is not bright, but its albino form was learned to dye artificially, receiving multi-colored fishes, called caramels.

The mentioned representatives of the haratsin ones are capable of living in small aquariums, however they are more demanding in terms of conditions. In particular, they prefer soft, acidic water and do not like massive changes, so the water for the aquarium is better to peat and change regularly, but little by little. In addition, in the aquarium with these fish is very desirable to have live plants.


Because of their funny appearance and behavior are very popular with beginners. However, they often lose sight of the fact that rather large catfish grow from the majority of cute little mustaches sold in pet stores. Torakatumov, plexostomus, pterigoplihtov and antsistrusov in an aquarium with a volume of 30-40 liters to keep absolutely impossible.

An unpretentious pygmy corridor (Corydoras pygmaeus) or its close relative dwarf corridor (Corydoras hastatus, catfish) is well suited for small aquariums. They grow only about 3-4 cm, they feel good in a large range of hardness and acidity, do not pay attention to the intensity of light, feed on any dry and live food, if only he was small enough and placed in their mouths. Требовательны только к температуре. Она должна быть в пределах 24-26°С. Стайные рыбки, необходимо содержать их группами не менее 5-6 штук.

Ещё один мелкий сомик - отоцинклюс. Большие объёмы воды ему для жизни тоже не нужны, но для него обязательно наличие живых растений, растительная подкормка и чистая вода с низким содержанием нитратов.

Все эти сомики миролюбивы и могут ужиться с любыми рыбками, которые не будут их обижать.


If a novice aquarist is immediately serious and ready to spend time on caring for an aquarium and studying special literature, you can recommend him to buy the most simple cichlids - the angelfish and black-striped chichlases. These species need a sufficiently large amount of water (at least 100 liters per pair) and careful selection of neighbors, but otherwise they are not too demanding.

In conclusion, it is worth noting that there are no aquariums and fish that do not require care at all. Fish, like frogs, turtles, tritons are living creatures, and care about them should be constant. If you don’t want to mess with the aquarium, and you just want beauty and pleasant murmur, it’s better not to torture animals and not to suffer yourself, but to buy a bubble panel and admire its pacifying gurgle.

In addition, it is not enough just to choose unpretentious fish, it is necessary to consider the following:

  • fish must be compatible, since if, for example, simple guppies and barbs are placed in one aquarium, nothing good will come of it;
  • it is preferable to place in one aquarium related species or species that live in nature under similar conditions;
  • when choosing fish, it is necessary to take into account what maximum size they can achieve, and based on this, determine the capacity of their aquarium;
  • most small fish are schooling, they need to be acquired immediately by the group.

Only by observing these conditions, you can make your first aquarium a source of beauty and pleasure.

The story of the small and unpretentious fish look at the video:

Aquarium Aquarium: Methods and Methods of Enriching Aquarium Water with Oxygen

or methods of enriching aquarium water with oxygen

Everyone knows that equipment for aeration of aquarium water is paramount and vital.

However, many beginners and even already experienced aquarists do not know how it works, they do not fully understand why it is needed and what happens in an aquarium with a lack or excess of oxygen.

In this article, I would like to try in a simple narrative manner to lift the veil of aquarium aeration secrets, to bring excerpts from the already written material of Runet, and also to tell about some of the "secrets" of O2 supply to the aquarium.

I think I should start with a short story about mechanical aeration, by which I mean the process of mixing air with aquarium water using aquarium equipment (pumps and compressors).

The principles of operation of such equipment are well known and understood by everyone, so I will not focus on them. It is more interesting to tell about two misconceptions of newcomers of the aquarium craft, connected with the aeration of the aquarium water by mechanical means:

1. Usually everyone thinks that the enrichment of water with air occurs through bubbles, which the compressor will drive into the water. However, it is not! Mixing air with water occurs on the surface of the water. The aerator creates vortices and vibrations from bubbles on the water surface, as a result of which mixing occurs. We can say that the saturation of aquarium water with air (oxygen) is not due to the bulbushes, as such, but from their intensity and water flow, which improves the absorption of oxygen from atmospheric air.

2. The second important nuance of mechanical aeration is its continuous operation. A big mistake for beginners is to turn off aeration for the night, so that it does not rustle. Such an action can lead to fatal consequences, because overnight asphyxiation will “earn” not only fish, but also all hydrobionts, up to nitrifying bacteria, which leads to a disturbance of biobalance and as a result, the aquarium gets a “dead bog” in which disease-causing bacteria are swarming. and live algae!

With that said, it should be noted that you should not save money when choosing and buying equipment for aeration of the aquarium, it must be of good quality and sufficient power. It is desirable that it had various nozzles and created a good "purge".

A huge role in the "aeration of the aquarium" is played by live aquarium plants. Aquarium plants are perhaps the only natural source of "pure" oxygen - O2, which is released during photosynthesis.

The presence of abundant vegetation in an aquarium will have a favorable effect on its climate and, in particular, on the concentration of oxygen in the water. However, the plants are not a stable and unconditional supplier of oxygen to the aquarium. It is worth saying that the process of photosynthesis, in which plants emit oxygen is possible only if there is sufficient illumination and the necessary amount of CO2 (carbon dioxide). As soon as the light in the aquarium turns off, the process of photosynthesis stops and the opposite happens - the plants begin to consume oxygen.

From the above, we can draw two conclusions:

- Aquarium plants are not replaceable helpers "oxygen supply in the aquarium." I generally keep quiet about their use in setting up the biobalance and their participation in the fight against NO2NO3.

- Alas, aquarium plants are not a panacea. Many people are mistaken in thinking that plants need only carbon dioxide, no! They also "breathe" and they need oxygen at night.

Well, now, before revealing the "aquarium-oxygen secrets," let's define

what is my oxygen concentration is normal

ANSWER: 5mg / l and more

Measure the concentration of O2 in the aquarium, you can with the help of tests that are sold in many aqua stores

Speaking about the concentration of oxygen, it is necessary to make a small reservation about overdose.

There are various opinions on this issue. Some, in the old-fashioned way, say that oversaturation of water with oxygen is dangerous. Other, more progressive comrades, on the contrary, say that the abundance of oxygen favorably affects the life of the aquarium. The arguments of both are interesting, but are a separate topic for conversation.

I personally tend to think that a lot of “oxygen does not exist” (conditionally, of course). Oxygen is poorly soluble in water, it is ten times worse absorbed than carbon dioxide. Therefore, in order to achieve an overabundance of O2 concentration, it is necessary to make a lot of effort, moreover, you need to be blind so as not to notice an overdose. Yes, the pH may drop sharply from an excess of oxygen, they say that colonies of beneficial bacteria are dying from its excess ... but this is such a rare situation that 99% of aquarists have never even thought about it.

And now, the promised tricks and secrets of aquarium aeration

Secret number 1: Many people know that oxygen consumption by hydrobionts increases with increasing temperature, since the respiratory process increases with increasing temperature. On the other hand, the concentration of oxygen in water is highly dependent on temperature. At a temperature of 20 ° С it reaches about 9.4 mg / l, at 25 ° С - 8.6 mg / l and at 30 ° С - 8.0 mg / l.

This statement can be perfectly used in cases of fish asphyxia. In addition, this statement disciplines beginners who think that plus or minus degrees does not matter.

Secret number 2: Perhaps the most valuable advice. Few people know about the benefits of using HYDROGEN PEROXIDE in an aquarium, this is what it does:

1. Revives choked and suffocated fish;

2. Fights against undesirable living creatures in the aquarium (hydra, planarians);

3. Fights against external protozoa and parasites;

4. Effective with bacterial infections on the body of the fish and its fins;

5. Fights against blue-green algae in an aquarium;

6. Fights algae on plants;

Very well talks about the benefits of hydrogen peroxide to many well-known and respected St. Petersburg aquarist V. Kovalev on the site "Living Water":

Hydrogen peroxide - This is an environmentally friendly product. In water, it breaks down into water and oxygen - harmless substances. Therefore, if it is used correctly, then the useful microflora in the filter and the soil can be saved completely, or only slightly podzadushit (too much oxygen is released in the overdose and in the filter, which is not good for bacteria). But the microflora will quickly recover, because no harmful substances have entered the water. Fish with proper dosing peroxide does not poison. If when applying peroxide on the sponge filters, the walls of the aquarium, fish and plants bubbles appear, then the dose was great. Only barely noticeable bubbles on mechanical filters are permissible.

Pharmaceutical 3% peroxide is used for:


Addition to 40 ml on 100 l. When they begin to pour bubbles on the glasses, filters and, possibly, small fish, the water should be changed, the blow-down should be strengthened. If there is no effect in 15 minutes of exposure, then no longer fate ... For resuscitation of fish affected by high doses of carbon dioxide, 25 ml per 100 l is usually sufficient.


Concentration to 40 ml in 100 l. It is necessary to make a few days in a row before a complete victory over the enemy. At the same time, plants can be frozen, but if lower concentrations are applied, then it is not possible to win, although the plants will be alive. However, as a rule, everything turns out, the process takes a week or more. Anubias-type peristicular plants are relatively resistant to peroxide.


If your aquarium has your favorite plants, then you cannot exceed dosage 25 ml per 100 l once a day. Fish usually tolerate dose without harm 30 or even 40 ml per 100 l. The effect of daily application is noticeable on the third day. For a week, everything passes. The dose that you can still fight algae is 20 ml per 100 l. Long-stemmed plants with feathery leaves do not tolerate peroxide, so this dosage should not be exceeded. Stylist plants can be redeemed several times in a separately prepared peroxide solution 50-40 ml per 100 liters. Hold for half an hour, an hour. I do not know the exact time. They say that the fouling flip flops can be reduced. It is possible that peroxide will help in the fight against Vietnamese in the aquarium (20-25 ml per 100 l). But in this case it is still necessary to reduce the nitrate and phosphate contamination of water.


25 ml per 100 l daily or 2 times a day multiple times (7-14 days).
You can prepare a therapeutic solution of peroxide from the industrial product of perhydrol - about 30% of prekis. That is, it must be diluted 10 times to get an analogue of pharmacy peroxide. The substance is caustic and explosive! It is possible to dilute only with water in a plastic container. Contact with metal, alkalis, organic solvents should not.

Source: //

Thus, taking into account the topic of the article, it should be said that hydrogen peroxide is "unique" and plays a crucial role! With its help you can instantly enrich the aquarium water with oxygen and thus save the fish, even in the severe stage of asphyxiation.

SECRET number 3: Many people know what oxygen pills are and many often use them when transporting fish. However, few people know and come across such aquarium equipment as OXIDATORS.

Oxidators are different: for the long transportation of fish, for mini aquariums, for large aquariums, for ponds. Their essence is simple - hydrogen peroxide is placed in the vessel to which the catalyst is added, after the reaction begins, as a result of which oxygen is released.

Video how oxidizers work for aquarium

Below is a line of oxidizers, which will reveal the whole point. OXIDATOR A

Dimensions: diameter 9 cm, height 18 cm

Container Content: for aquariums up to 400 l. - 250 ml of 3% hydrogen peroxide solution, for 600 l - 250 ml of 6% solution.

Duration of work: at a temperature of 25 ° C from two to eight weeks, depending on the concentration of the solution and the number of used catalysts.

The absence of bubbles coming from the device indicates the need for recharge of the OXIDATOR.

1 liter of peroxide is enough for 1 month for 20 large fish.

You can also use it in a larger aquarium, but the duration of the instrument is reduced.

If your aquarium has a capacity of up to 400 liters and the two-week OXIDATOR operation time is too small for you (for example, you are going on vacation), you can use two OXIDATORS A by placing one catalyst in their containers. As a result, the duration of their work before recharging will increase to four weeks.


Dimensions: diameter 4 cm, height 6 cm

Container contents: - 20 ml of hydrogen peroxide solution.

Includes two 50 ml bottles with 4.9% hydrogen peroxide solution.

Duration of work: at a temperature of 25 ° C 2 - 4 weeks depending on the number of catalysts and the volume of the aquarium.

You can install up to four MINI OXIDATORS in an aquarium, or replace its catalysts with more powerful ones (from W, D or A OXIDATORS).

MINI OXIDATOR - DOESN'T REPLACE the compressor or filter, it is a universal oxidizer and works in the absence of electricity, long-term transportation of fish, increased demands on the oxygen content of the fish or summer increase in water temperature. Kills harmful bacteria and treats outdoor fish diseases.


Dimensions: diameter 8.5 cm, height 8.5 cm

Container Content: for aquariums from 60 to 150l. - 125 ml of 3-6% hydrogen peroxide solution.

Duration of work: at a temperature of 25 ° C, 1 liter of peroxide is enough for 2 months of work in an aquarium with 10 large fish.


The first safe and self-regulating device that can be year-round supply ponds with oxygen without the use of hoses and electrical wires, even in a fierce winter.

It is designed for garden ponds, as well as large aquariums in excess of 700 liters.

Dimensions: diameter 15 cm, height 18 cm

Container contents: 1 liter of 6-30% hydrogen peroxide solution.

Duration of work:

In the summer with a single refueling - 1-2 months.

In winter, under ice - for 4 months.

The annual need for a solution, depending on the temperature, is 3-5 liters.


Floats in the shipping container due to the ring float.

The device allows you to transport or contain a large number of fish (up to 25 goldfish with a body length of 8 cm in 20 liters of water) in a small container (can, thermo bag, bag, etc.) with a volume of 2-20 liters for a long time without an additional compressor or filling the bag with oxygen.

Duration of work - from 144 hours (at 9 ° C) to 36 hours (at 25 ° C).


The FTC OXIDATOR compact device allows you to transport or contain fish in a small container (bucket, plastic bag, etc.) volume of 2-20 liters for a long time without an additional compressor.

Increased oxygen consumption by fish with increasing temperature (within reasonable limits) is automatically compensated by the device.

One OXIDATOR FTc contains 1000 mg of pure oxygen.

The working time at a temperature of 20 ° C is approximately 12 hours. As the temperature rises, the operation time decreases, but the amount of oxygen released increases. When the temperature decreases, the duration of work increases.

It is worth noting that oxidizers are very rarely used by aquaquimists in the post-Soviet space. They cost relatively not expensive - OXIDATOR A costs about $ 100, plus they save energy ... but alas, there is not even anyone to ask anyone about the practice. Most often they are used only for long shipments of fish.


Aeration, enrichment of aquarium with oxygen interesting video

Why in the aquarium: all the answers

Why in the aquarium ... all answers!

1. Why aquarium? Long since, since the times of ancient China, people were fond of breeding aquarium fish! This is an interesting and exciting experience. Like any thing, an aquarium has its own advantages and disadvantages, but it seems to me that a hobby for aquarism makes a person kinder and better. Look, please, here are these articles: I WANT TO LEAD AN AQUARIUM! HOW TO BUY AN AQUARIUM? I WANT AQUARIUM WITH WHAT TO BEGIN? Typical aquarium questions beginners. And also, AQUARIUM FAILURES: do we really need these fish?

2. Why in the aquarium snails? Snails, along with fish, are full inhabitants of the aquarium. In addition to the aesthetic characteristics, aquarium snails are health workers of the aquarium world - they eat fish waste and waste products, clean the walls of the aquarium and plants. In addition, some fish are not averse to eating clams, and therefore many aquarists get them as a food. Read the YELLOW SNAIL AMPULARIA IN YOUR AQUARIUM and the SNAIL COIL.

3. Why in the aquarium light? In fact, the light in the aquarium fish do not need. The person needs him more to be able to observe his pets at any time of the day. Light is definitely needed by aquarium plants that simply will die without it, so if there are live plants in your aquarium, keep this in mind. To find out which plant, how much light you need, see AQUARIUM PLANTS.

4. Why in the aquarium plants and algae? Plants, both on Earth and under water, are “light” ecosystems! Do not underestimate the role of plants and algae in an aquarium. They are the main regulators of the normal operation of the aquarium biosystem. In addition, many fish aquarium just need a vegetable feed. And some fish use plants as shelters and spawning grounds. See FISHING EATING PLANTS WHAT TO DO?

5. Зачем в аквариуме со2? Зачем углекислый газ в аквариуме? Система со2 и углекислый газ необходимы аквариумным растениям. При наличии такой системы растения хорошо себя чувствуют и растут. Смотрите, СО2 для аквариума: система подачи углекислого газа + таблица СО2!

6. Зачем в аквариуме нужен компрессор, фильтр? Компрессор, фильтр, аэрация - это базовое оборудование, которое необходимо для функционирования аквариума. They provide the presence of dissolved oxygen in the water, which is necessary for fish, they clean the aquarium water from waste products and other harmful substances. In addition, the aquarium water is circulated through this equipment. See WHAT YOU NEED TO AQUARIUM: what to consider when choosing an aquarium and which fish to buy?

7. Why defend water for an aquarium? Tap water is defended in order to get out of it excess dissolved oxygen, which is detrimental to fish. In addition, some impurities evaporate from the settled water — for example, bleach. See WATER CHANGE IN THE AQUARIUM! WHAT WATER IS NEEDED FOR THE AQUARIUM? How much water should be defended for the aquarium? What kind of water to fill! and boiled thawed or distilled water for an aquarium.

8. Why add salt to the aquarium? Salt is used to treat aquarium fish and for some species of fish that love brackish water. Read the article PUD OF SALT IN THE AQUARIUM: how much salt to add to the aquarium?

See Aquarium for beginners. Category: Aquarium Articles / EQUIPMENT AND FACILITY AQUARIUM | Views: 7 002 | Date: 3-06-2013, 16:02 | Comments (1) We also recommend reading:
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The most unpretentious and small aquarium fish with photos

The most unpretentious aquarium fish, the smallest aquarium fish. TOP 10 DIFFICULT FISHERS Keeping fish is not as difficult as it sounds. However, aquarium fish, like any living creature, require care and time, which many people, by virtue of employment, simply do not have !!! This topic is left based on the following requirements for aquarium fish: unpretentious fish, small fish, easy-to-keep fish, the most enduring aquarium fish, tenacious fish, easy-working fish. 1 place Guppy

I think many aquarium fish experts will agree that the first place is given to guppes.

Everyone probably knows these fish ... even those who have never seen aquariums. We can say that these fish are the fish of all children of the former USSR (they were in all Soviet aquariums))). The fish is very beautiful and unpretentious. The tail fin is her beauty. The simplicity of the fish is that it can withstand "harsh conditions of detention." I happened to see an aquarium with guppies. without aeration, without filtering, without plants, without proper feeding etc. - horror, terrible dream aquarist. Nevertheless, guppies managed not only to survive in such an aquarium, but even tried to multiply. So you should not mock the fish !!! But their endurance and vitality sometimes affects.


2nd place Swordtails

A very famous fish, as a result of persistent selection, a large number of swordtails of various colors and shapes were bred. Males are distinguished from females by the presence of a "sword" on the lower edge of the caudal fin.

Swordtails are kept in flocks in a densely planted aquarium. The minimum size of the aquarium from 10 liters (but better is more). A good volume of aquarium for a small group of swordtails is 50 liters.

An interesting fact about these fish is that the female swordtail can “at some” moment become a male, i.e. change the floor. This is due to the struggle for the survival of the species.


You can read more about MUCHENORTSAKH here ...

3rd place Somiki corridors

It should begin with the fact that all aquarium catfish - a priori unpretentious. Moreover, they are "nurses of the aquarium world": they clean the soil and eat the remains of vital activity. The corridors are chosen from all catfish, since in addition to the gill, they have intestinal respirationi.e. if aeration stops, they will live for a long time.

The fish are very peaceful, calm. They slowly swim along the bottom in search of food. In the aquarium they are usually kept in flocks. Fish, do not pose any threat to other inhabitants of the aquarium.

You can read more about CORRIDORATUSES here ...

4th place Mollies

Molly, like guppies - viviparous fishes. Unpretentious and tolerant of poor conditions. Nevertheless, they are more capricious than the “troika winners”.

Fish suitable for beginners and young aquarists. The fishes most difficult to keep from all members of the family are demanding of conditions, they do not tolerate low temperatures, some like “salty” water, like bright light, etc.

You can read more about MOLLINESIA here ...

5th place Tetras - Harazinki

All tetras are small, brisk, not capricious fishes. However, they will not be able to survive in "Spartan conditions" as guppies. They need aeration and filtration. You can keep them in an aquarium by a group (from 5 individuals) with a volume of at least 35 liters of water.

You can read more about TETRAH here ...

6th place Ternetsii

Very famous little fish. Fish energetic, mobile. Fish get along well with other types of fish. Somehow my terntions even lived with small cichlids. Recommended aquarium with a volume of at least 30 liters of water, densely planted with plants. Aeration, filtration - yes!

You can read more about TERNIA here ...

7th place Danio (rerio, pink)

Starting from the 5th place TOP, all the fish require unpretentious attention. Tanks are different from them - briskness and speed of movement. They can coexist with many species of fish, even with fish of medium and increased aggression: scalar, goura and even with small cichlids.

Read more about DANIO here ...

8th place Torakatum

One of the famous large catfish of the aquarium world and excellent attendants of the aquarium. Peaceable and unpretentious to the content. They can be kept in a common aquarium with thickets of plants and a large number of shelters. Fish, do not pose any threat to other inhabitants of the aquarium. Compatible with all kinds of fish. The neighbors are not recommended only one hundred percent aggressors and predators.

You can read more about TORAKATUM here ...

9th place Gourami

Gourami - are medium sized fish. Entered in this TOP due to gill labyrinth - fish do not need aerationthey breathe atmospheric air. Really peaceful fish, but sometimes aggression. Some individuals taken separately are even very aggressive, as they say, as lucky.You can read more about GURAMI here ...

10 place Barbus

Barbusses are schooling, small fish that can stand up for themselves! If you decide to start barbs, I recommend to allocate for this a separate aquarium, "barbusyatnik." "Pirate" temper, the ability to stand up for themselves - deserve 10th place. You can read more about BARBUSH here ...

Of course, the above TOP is conditional - always remember the words

Antoine Marie Jean-Baptiste Roger de Saint-Exupery

"We are responsible for those who have tamed"

We also recommend you to look at the colorful brochure "Popular types of aquarium fish". This brochure contains all popular types of fish, with a description of their conditions of maintenance, compatibility, feeding + photos.

(to view or download, click on the image)

An interesting video about unpretentious and small aquarium fish

Additionally, we invite you to view a large photo collection of small and unpretentious aquarium fish

Cleaners and orderlies of the aquarium - wholesome fish, shrimps, snails relieving algae

Who benefits from the aquarium?

Every aquarist, sooner or later, but such a question arises.
First, we acquire unpretentious fish, simple in content. Gradually interested in more complex fish, more interesting and rare. Often, choose the fish for the beauty of color, shape, behavior.
But the moment comes when we are looking for useful fish, albeit not so bright and interesting in behavior, but which make it easier for us to take care of our aquarium world, who clean the aquarium, are its nurses and bring unconditional benefits!

I, too, came this moment. And I am interested not only in healthy fish, but also in healthy shrimps and clams. I have different kinds of algae living in aquariums different in parameters and population. That is, the fight against algae, without the use of aquarium chemistry, prompted me to these searches. I propose not to assess the degree of usefulness of certain inhabitants, but simply to create a list of aquatic organisms, bringing clear benefits in a freshwater aquarium.
I think this list can be replenished with your help.
So, let's begin. Immediately come to mind such useful fish as:
Siamese Algae Eaters (SAE) and their relatives


Much has been written about these fish, practically, each aquarist has representatives of these species. Their use has long been tested and proven!

Seaweed shrimp

These wonderful creatures have recently become increasingly popular with aquarists. Our members of the forum, also appreciated the contribution of shrimp to the fight for the purity of the aquarium. In confirmation of this, a number of articles on shrimp appeared on our website.
The best fighter with nitchatka - Amano's shrimp
Cleaners of our aquariums, which are all, without exception, shrimp, eating up food particles, microscopic organisms, rotten leaves of aquarium plants.
Shrimp Red Crystal

Shrimp Cherry

Black Tiger Shrimp

Algae Snails and orderlies

Snail helena. Predatory snail-eating snail.
Thunderstorm of all snails !!!

Next, I would like to elaborate on some snails.

Snail Neritina "Zebra" "Neritina natalensis sp" Zebra "
Some aquarists call it a tiger snail. They say that you can not find two snails with the same ornamentation of the shell. The homeland of these snails is hot Africa.
Content temperature - 25-27 degrees Celsius, PH of 7.
The cover of the aquarium should be tightly closed, because there are shoots of snails from the aquarium. For a short time this snail can live on land. Frequent attempts to leave the territory of the aquarium may indicate that the parameters of the water do not like the zebras. Zebras live in the aquarium for about 4-5 years, the size of the shell grows to 2-2.5 cm. In the aquarium, this snail does not reproduce.
Snail Neretina "Hedgehog" "Neritina juttingae"
The shell of this snail is decorated with spiral ribs and spikes. The size of the snail is 2-2.5 cm. Life expectancy in an aquarium is about 4 years. The optimum water temperature is 25-28 degrees, the pH is above 6.5.
Snail Neretina "Black Ear"
Conditions of detention, dimensions are similar to the previous instance, the lower threshold of temperature may be 22 degrees.
All neretina excellent cleaners aquariums, tirelessly clean stele, large-leaved plants, stones, snags and decor from algal fouling. Moreover, the aquarium plants do not damage at all. The only disadvantage of these snails - laying eggs on the glass aquarium.
Separately, I want to stay on a tiny snail -
Horned snail Neritina Clithon

These snails have a fairly wide range of habitats Japan, Thailand, the Philippines, China, Indonesia.
The photo shows that there are many options for coloring horned snails. A common feature - the presence of small horns on the shell of snails.
Life expectancy in an aquarium is up to 5 years. The snail is only 1-1.5 cm in size. But its capabilities deserve the love of aquarists: snails can crawl even into the most hard-to-reach places, clearing them to shine.
According to reviews of aquarists: the horned snail perfectly cleans diamond algae from Anubias leaves, glass, stones, decorations.
Water temperature should not be below 24 ° C, PH 7-8. Recommended for 100 liters of 10-15 stuff.
Like all neretina, horned snail does not breed in fresh water.
This video, in accelerated playback, shows how successfully a tiny horned snail copes with algae.
Porcelain Septaria (Septaria porcellana)

This extremely slow snail is also called the snail-turtle. It belongs to the family Neritidae.
Related Names Septaria porcellana - Green Turtle Snail, Cellana toreuma, Neritia Crepidularia, Bourbon Nerite.
Dimensions septaria forforova from 1.5 to 3 cm. Conditions: temperature 22-26, PH from 6 to 7.5. Filtration, aeration, water changes are required. The life of the aquarium in the presence of food (algal fouling) is about 2 years.
This remarkable snail was first discovered in 1758. The homeland of the snail is Indonesia and the Philippines.
In addition to its slowness, this snail is distinguished by its unusual form of carapace - a flat form. Snails are of different genders, but breed only in brackish water, therefore reproduction of porcelain Septaria in a fresh-water aquarium is not possible.
The snail firmly sticks its foot to the surfaces. In no case can not try to tear it off, thus you can snatch the snail's leg, which will lead to its death. Rotational movements, very carefully, you can try to peel the snail from the glass.
Like the previous types of neretin, Septarium porcelain, is also an aquarium nurse, and feeds on algal fouling. Excellent cleans the aquarium from algae, including from the Vietnamese. Does not damage plants. Gets along with all the peaceful fish and shrimps. Be careful with tetradonts, crayfish and other predators. I saw these snails in a cichlid. Feel great, and the glass already glistened with cleanliness.
- without algae the snail can die from hunger!
- the snail is not able to move on sandy soil!
Here are the rave reviews of the happy owners of these snails:
"This crumb in an hour has already collected two bunches of Vietnamese, and is clearly not going to stop," "Not able to move on the sand. Excellent creeps on the ground 1-2mm! Trying to climb on some plants with low and wide leaves. It easily climbs the glass on the side of the snags. Still - along the glass they are buried in the sand, where algae sit between the sand and the glass, and happily eats them out. I need another septar, "" in a week a quarantine of 30 l was cleaned from the greenery, the glasses shine on them, waiting for aqua overgrown to impossibly excellent f ulitosa ".
Septaria also hangs its eggs on the scenery

And these mollusks very interested me !!
And it all started, here with this photo:
In two aquariums, water is poured from the same reservoir, but freshwater mussels, which are live filters, were placed in the second aquarium!
The same function they perform in aquariums.
Corbicula javan snail (Corbicula javanicus)
or sharovka yellow javanese or gold bivalve

The homeland of these mollusks: China, Indonesia, Vietnam and other Asian countries.
The optimal parameters for the content: temperature 15-30 ° C, PH 6.4-8.5, gH 10-24.
Not demanding on the quality of water in the aquarium, but there must be a good saturation of water with oxygen, which means aeration in the aquarium is obligatory. Water changes and filtration in the aquarium are also needed. Corbicula grow up to 3 cm in size. Life expectancy: 4 - 7 years
The recommended soil is sand of a fraction of 1–3 mm, and the corticles are almost completely buried in it. The soil layer should be at least 2-3 cm.
Corbicula are excellent helpers in the aquarium against cloudiness of the water, as they are filter feeders.
Passing water through them, they feed on the microorganisms contained in it.
According to different sources: Someone recommends keeping one tank per 100 liter aquarium. There is information about the content in 20 liters of two or even three individuals.
Such mollusks are recommended to be contained in spawners, where the need for clean water is especially important. Corbicula lets through 5 liters of aquarium water per hour!
In aquariums where these mollusks live, the water is always crystal clear, it does not bloom and does not have suspension and turbidity!
An interesting fact is that in aquariums that contain corbicules, ichthyophorosis diseases do not occur. According to aquarists, corbicules retain ichthyophthirius cysts that swim in free flight.
You can keep a corbicul with all peaceful fish and shrimps.
Corbicula are hermaphroditic, reproduction problems in the aquarium there. Viviparous corbicula reproduce tiny snails, barely visible in the unaided eye. In an aquarium, newborn corbicules look like a muddy cloud, then sink to the bottom, where they continue to grow and develop.
If plants grow in your tank with a weak root system, then corbicules, plowing up the ground, can easily dig them up. thanks

The author of the article is Esta (Natalia Polskaya),
for the provided material and cooperation!

What fish can live without oxygen and filter. With an open aquarium?


Labirint, or creeping (Latin. Anabantoidei, outdated name - Labyrinthici), is a suborder of perciformal fishes, which have a labyrinth organ, which allows fish to additionally breathe atmospheric oxygen. Predominantly freshwater fish with intermittent African-Asian distribution; Missing in Madagascar. Possess a wide variety of morphological and behavioral signs.
Gourami, macropods, swordtails, lyalius and many other famous aquarium fish.


Do not forget about plants and snails (they are part of the natural purification of water)


Without oxygen in our area - hardly any. Any water has to be heated, and so that warm water does not collect at the top of the aquarium, air blowing is required to mix the water. Therefore, in the winter, even in a fully overgrown aquarium, where there is enough oxygen, the macropods and cardinals have to switch on the compressor simultaneously with the heater in winter.

Elena Gabrielyan

It is undesirable to keep fish without a filter, sincethe waste and food decomposing at the bottom will spoil the water and it will have to be changed frequently in a small aquarium, this will solve the problem using a filter, and labyrinth fish live without oxygen: Cocks, Gourami, Lyalius

Alexander Komendantov

All fish are aerobic, no one can live without oxygen. Without aeration is another matter, the question of the volume of the aquarium. If a large aquarium - any. The labyrinth, lungfish, anabass, jumpers, and many catfish can live in a minimum amount without aeration — they are all able to breathe atmospheric air. If you put a heating pad on the bottom along the back wall - there will be no problems with water stratification.

Victor Melkozerov

Any. The main thing that there was no resettlement, the calculation of 3 l on the fish, guppies do not count, the labyrinth will take less. Flush live food, water will not need a clean filter. In the water or silver spoon or coin. Greetings from St. Petersburg.

Can an ordinary goldfish live in a simple aquarium with water without supplemental oxygen ??? People please help !!!


A lot of things are written ... and the fact that you need a large aquarium and the fact that you need a filter is necessary, but I personally learned that 1 goldfish can live well in a 15 liter aquarium without any additional tools, but with live seaweed (she loves to eat them) . In such conditions, the goldfish has lived with me for almost 2 years, I believe that this is not enough.


Goldfish reaches sizes of 6-8 inches, so even for one fish a large aquarium is required ...
The filter is necessary because it is very dirty fish, the process of digesting food which is very fast.