What fish live in the aquarium


Top 10 fish to start with

Deciding what kind of fish to start first in your tank can be sudden, and can be thought out. Unfortunately, novice aquarists are often guided by the very first impulse, completely without understanding the fish. And then, instead of joy and pleasure, they get a headache and problems. You need to choose the fish wisely, because their life and your comfort depend on your choice. Before you go to the store or to the market, study all the available information about the fish that you liked.

What kind of fish is not worth buying for beginners, we have considered here. And the top 10 unusual fish here.

And in order to make it easier for you to navigate, we have compiled a list of the best aquarium fish for beginners and briefly described them. All of them are distinguished by unpretentiousness, tolerance to conditions in an aquarium, peaceful nature, livableness and modest size. We hope that it will help make your choice easier!



A classic for any newcomer to aquarism is guppies. They are very unpretentious, livable, and just get divorced. It is very easy to distinguish males from females, males have a big tail, they are much brighter, and their anal fin is elongated. The females are larger, fuller and the anal fin is shorter, and most importantly - they are gray, only the tail fin can be colored. They are viviparous, which means - the fry immediately swim and are adapted to life. At one time, the female guppy can sweep from 10 to 60 fry. But if you leave the fry in the general aquarium, it will be eaten quickly, you need to catch the fry in a separate container. To breed them is very simple, it is enough to keep together the males and females.

Guppies eat all kinds of feed, can grow well on branded feeds - flakes, granules, etc. It is worth noting that beginners are not recommended to start pedigree forms of guppies, because of the long mixing of blood, they, on the contrary, have become capricious and difficult to maintain.

Males of guppies of different breeds

There is also a species of Endler's guppy. The differences between endlers are much smaller in themselves, the males are not veiled, they are much more agile, the fry are less infected, but the fry themselves are larger and breed more often.

Sword-bearers / Molly / Pocilia /

We will unite them in one group (swordtails / mollies / squares /), since they are very similar in behavior and content, although outwardly they are very different. Just like guppies, they are viviparous. And that means there will be no problems with the fry, he immediately swims, eats, hides.

They are very simply divorced, the principle is the same as that of a guppy - just keep the males and females together. They are very bright and mobile fish, you will not need to look for them to consider, on the contrary, they will always beg for food from you. They tolerate various conditions in the aquarium and forgive mistakes that beginners often make. They eat all kinds of live, artificial, frozen feed. In general, they are similar to guppies in content, but outwardly larger, have a variety of color and body shape. As a precaution - do not buy a lot of male Swordtails in one aquarium, they can fight!

Petilia and mollies during feeding

Danio rerio

Danio rerio is a small (up to 5-6 cm), elegant fish. For its small size, peaceful disposition and unpretentiousness, it has earned great popularity in aquarium.

Since this is a schooling fish, it is better to keep at least 5-6 individuals. The aquarium can be planted with plants, but it is important that the danios have free space for swimming near the surface, as this is a very mobile fish. If you are going to have a veil form, do not plant them with fish that may tear off fins, for example, with a Sumatran barbus. The aquarium should be closed, as danios can jump out of the water.

Omnivorous, they eat any kind of feed - branded, live, frozen. It is better to feed them with flakes, as they pick up food from the surface of the water and they don’t collect them for a long time without sinking. It is very easy to breed danios, for once the female lays from 200 to 500 eggs.

Danio rerio


This is a very small (2.5-3 cm) and very unpretentious fish. However, it is brightly colored, just divorced and completely non-aggressive, even the cardinals do not touch their fry. They tolerate cold water, some even keep them in the summer in a pond in the yard. They love to move in the middle layers, and also like to gather in flocks. You need to keep them in small flocks, from 6 pieces. Although it is possible and large, with its modest size, the cardinals do not require large aquariums. With good content can live up to 3 years.


These are small, mobile, beautiful and pack catfish. There are many different types of corridors, but the most popular are speckled catfish and golden catfish. All of them are similar in their behavior - living at the bottom, they are constantly looking for remnants of food, thereby cleaning the aquarium. They are very mobile, while remaining quite small, and carry the widest range of conditions.

Any type of feed is suitable for feeding, but it is important to ensure that the feed falls to the bottom, and catfish do not stay hungry while other fish stuff their bellies. It is best to feed the corridors with special food for catfish, they quickly sink, and falling to the bottom do not fall apart. It is better to keep the corridors in the flock, they like to live surrounded by relatives, and it is very interesting to watch them in the flock.

Speckled catfish

Wedge specks

Very beautiful and very small fish, which is perfect in the neighbors for all of the above fish. Grow up to 5 cm and very peaceful. Beautiful coloring, on which a black spot stands out (for which it got its name), its small size and peaceful disposition made it very popular. It is better to keep the cuneiform pack in a flock, and there should be enough free space in the aquarium for swimming. The flock rasbor keeps together and very much decorates any aquarium. You can feed a variety of feeds, it is only important not to give large ones, as it simply cannot swallow them.

Flock rasbor


This is one of the most unusual fish that even an inexperienced aquarist can see.

Related to the vines, it resembles a small snake. But it is completely harmless, and quite durable. Acantoftalmus often hides during the day, and in order for him to feel comfortable he needs shelter and soft soil in which he likes to dig. In soft ground, he is able to find and dig a buried moth, not to mention other feed.

If there is sand in the aquarium, it will be buried in it with pleasure. So it helps to keep the aquarium clean, eating everything that falls to the bottom. You can feed him with any sinking feed, but additionally pour feed for catfish, better at night. Can escape from the aquarium, you need to cover it. The readers said that in the sand they could dig in stones, but I had never met with such a thing, mine definitely did not undermine anything.



Fishes belong to the same genus - labyrinth. These fish live in water that is poor in oxygen and adapted to this by learning to breathe oxygen from the surface. You will see how they rise to it, to take another breath of air. Small, peaceful, males are very brightly colored, and their ventral fins have turned into long processes. You can feed any feed, including floating. Only give the moth with care and a little, it is poorly digested.

Already after the publication of the article, my readers corrected. The essence - liliaus can be difficult for beginners (he is just a little flaky and jealous of females). I agree, and add that there is another wonderful fish of the same kind - gourami. There are many types, but for beginners a good choice would be marble gourami. Very hardy, peaceful, of unusual shape and color. It is generally similar to lyalius, but larger and less demanding. So you can stop at this gorgeous fish, and start up a little later.

Cherry Barbus

Peaceful, small fish, the males of which have a very bright color, for which they got their name. This is a schooling fish, so to keep a cherry barb is better from 5 pieces. But you will notice that he keeps loosely, gathering in a flock only in case of fright. The size of the cherry barb is small, the color of the males is bright red and very noticeable, the requirements for the content are low. This is a good fish to mention on our list.

A pair of cherry barbs


Perhaps this is the largest fish from the list, grows about 15 cm, if the aquarium allows. But he earned his popularity for his unusual appearance, for clearing the aquarium and his stamina. Antsistrus is a catfish, but catfish is unusual, it lives in nature due to the fact that it eats algae and fouling.


And his mouth turned into a suction cup, with which he scrapes it all. In the aquarium, he is a cleaner walls and decor. The males have unusual growths on the head, making it very memorable. Peaceful, but with other males can arrange fights. For him, it is important vegetable food, you need to feed special pills.


Of course, this is an incomplete list, and after thinking it can be increased significantly. But the task was to acquaint beginner aquarists.

Beginners, I recommend first to learn all about the fish that you liked, and choose first of all hardy, easy-care, and peaceful fish that get along well with others in the general aquarium.
And experienced ask for your thoughts about the fish, which they consider simple, in the comments below. I am sure many beginners will thank you for it.

We select fish for an average aquarium

The decorative aquarium is a prototype of a home pond. Compliance with the basic rules of aquarium maintenance, aeration and settlement of companion fish contributes to the creation of favorable conditions for the peaceful coexistence of various types of aquarium fish. So, we select fish for an average aquarium

What kind of fish live in a normal aquarium

Before you buy an aquarium, you should find out what kind of fish live in an ordinary aquarium. The acquisition of an aquarium with an average volume of up to 150 liters opens up a lot of opportunities for its settlement by various types of fish, including exotic ones. In such an aquarium, you can create several variants of natural biotopes. At the same time, it is necessary to clearly divide the total volume of water into typical layers that create the most favorable conditions for the habitat of a particular type of aquarium fish. It is believed that if a fish’s mouth has a peculiar protrusion or is turned up, then such a breed prefers to dwell in the upper layer of water. Otherwise, the breed is bottom and populates the lower layers of water. With proper selection of aquarium fish all the layers of water in the aquarium are evenly populated, creating the impression of a natural ecosystem.

The optimal number of fish for each layer is calculated based on the displacement of the aquarium and the size of the aquarium fish. So, for fish up to 5 centimeters will need 1 liter of water. For large fish sizes, add 2-3 liters to each.

Depending on the characteristics of some species of aquarium fish, it is necessary to provide for settling calm and peace-loving fish in a separate layer of water, freeing up space for their more active counterparts.

Types of aquarium fish for an average aquarium

The most popular type of reservoir for an aquarium with a volume of up to 100-150 liters is the South American model. In this case, it is necessary to select small and medium-sized fish of the order of haracin (tetra, neon, terntion) or cichlid (blue cancer, scalar, parrots, discus).

It is also possible to populate such combinations of fish as Sumatran barbs and pelvihakromis (parrots), blue akaras, barbs and catfish, a cockroach, blue dolphins and iris.

The middle layer of water in the aquarium can be populated with a spotted leopard venom. This shy fish has an interesting camouflage color and prefers nightlife. Possessing a calm character, ctenopomes get along well with such fish as gourami, catfish and goldfish.

A medium-sized aquarium can be populated with a flock of 8-12 beauty fish of Congo. The scales of these fish have a rainbow color, so in the pack they look very impressive. In the community of this type of aquarium fish, most of the representatives of the order of the haratsin, small catfish, viviparous fishes and medium cichlid species can live.

To populate goldfish in an aquarium, you should reduce the density of fish landing, without limiting them in movement. The average aquarium is suitable for living a pair of goldfish.

To create comfortable living conditions for various types of aquarium fish, it is necessary to determine the possible composition of the soil and plants in the aquarium and regularly maintain its purity.

Who do the cockerel fish get on in the general aquarium

Today cockerels (lat. Betta splendens) are popular aquarium fish. Belong to the family Macropod, suborder Labyrinth fish. In males, the character is snooty, for which they have been nicknamed "fighting fish." They do not always tolerate settlements with other fish, it is difficult for them to live with their neighbors because of their pugnacity. If a male cockerel is housed in one aquarium together with another cockerel, then conflicts will arise between them that will result in bodily injuries and plucked fins.

But this does not mean that they can not be settled with fish. On the contrary, a good neighborhood harmonizes life in an aquarium. If your tank is spacious, it has created an excellent aquascap that resembles a natural biotope, there are many plants, shelters, a biological balance is established - then all inhabitants will be comfortable. An important rule - it is impossible for more than one male cock to live within the same aquarium. They can not be called territorial fish, but it so happened that they will fight. On one male you can settle several females, so it will be comfortable.

Betta splendens females are smaller in size, their fins are shorter, their character is calmer. But females can also conflict with each other, as well as with the male. Females can be kept in one nursery by 3-4 individuals. They are less aggressive, but their character is also unpredictable. If you notice that the betta fish show constant aggression towards their neighbors, and this leads to fatal consequences, then do not spare money for another reservoir, settling in it a restless pet.

Rules for keeping Betta splendens in a common tank

These fish tolerate temperature drops and can feel good at a temperature of +18 and +25 degrees Celsius. But you can not allow sudden drops, because they harm the health of the pet. Like a labyrinth fish, a cockerel should live in water that corresponds to the ambient air temperature in the room: + 22-26 degrees. Due to the fact that he knows how to breathe a labyrinth organ, aeration is not necessary - this should be taken into account by settling to him other fish that cannot live without dissolved oxygen. Replace the water should be once a week, 20% of the total volume of the tank. Do not forget to clean the bottom of the remnants of food and dirt.

What rules should be followed so that cockerels can live peacefully in an aquarium with other fish? These rules apply to all cockerels, which can result in peaceful cohabitation with representatives of different types of fish.

  1. It is not recommended to keep with betta fish with long fins and brightly colored scales. Although the males themselves have a beautiful appearance, they are painfully perceived by "competitors", which for them are external stimuli.
  2. You can not settle cockerels with large and predatory fish, for example, African and South American cichlids. The latter in themselves are peaceful creatures, friendly, but they do not get along with the fighting fish.
  3. Try to keep the fish in water that is suitable for everyone. You can not settle heat-loving and cold-loving species. For example, a golden fish cannot live in warm water, therefore it is incompatible with betta.
  4. Betta splendens fish can be settled with speckled catfish, tetras, gourami, swordtails, mollies. After settling the fish in the aquarium, observe their behavior. You can also keep the fish from a young age together, so they are better accustomed to each other. Fish should not be less than 5 cm in length. If the neighbor fish has died, do not hook the new fish with the rooster, otherwise it will score it.
  5. Compatibility with other fish will be successful if the betta lives in a spacious tank of 50-100 liters. There you can put a lot of decor, shelters, which will reduce to the "no" territorial claims and conflicts.

Take a look at the common cockpit aquarium.

There are such aquarium fish, the compatibility with which the betta is good, they live peacefully, with periodic fights that do not lead to death. These include gourami marble, cardinals, labo, lyalius, macrognathus, scalar. But it should be noted that the first days of the settlement should be monitored for their reaction, in case of aggression, they are settled separately from each other.

Almost perfect compatibility of the fish Betta splendens with platies, Donaciinae, black mollies, ornatusami, nagging gourami, akantoftalmusami, befortiyami, Ancistrus, minors, ototsinklyuchami, rasbora, black tetra, Congo, botsiyami, tarakatumami, lorikariyami, gastromizonami Siamese, brocade catfish.

Description of compatibility with certain types of fish

Males and guppies - it is believed that guppies and betts live in water with different parameters, therefore they are only conditionally compatible. There were examples of good compatibility, but it’s not always worth the risk.Males can chase guppies throughout the aquarium until their fins are torn off. Guppies can live at a temperature of 18-28 degrees, although 22-25 degrees for them more than acceptable temperature. The diet of both fish is the same, so some razvodchiki did not have difficulty in keeping.

Scalar and betta - compatibility is not bad, provided a spacious tank. These fish almost ignore each other, without attracting attention. The males will rather distort each other than the scalar will bother. However, during spawning, scalars become more aggressive and can drive all neighbors, including labyrinth ones. Set in the nursery a lot of shelters and plants to protect all.

Gourami - all species are close relatives of cockerels, so compatibility can be great. Gourami - curious creatures, tenacious and active, also feed, breathe with gills and atmospheric oxygen. Males do not bother them, sometimes it happens the other way around. Plant them together in a tank of at least 70 liters cubic. All Macropod enemies are the same: they are large and predatory fish, with which they should not be settled.

Look at the cockerels in the company of gourami.

Mollies and cockerels can live in an aquarium because they carry the same water parameters. But there is one fact - slightly brackish water is preferred by mollies, but Betta is not. Temperatures of 24-27 degrees is optimal for content. At low temperatures, both fish begin to hurt. Molly - viviparous fish that must breed in a separate, spawning tank, so that no one will destroy their fry.

The bets are alone in aggressive hydrobionts, so they can be moved to the males only with a flock of 4-7 fish. In the aquarium fights are small, reaching only 8 cm in length. Peaceful, you can keep them with the same neighbors, provided space and shelters. Males with them almost no conflict.

Corridors - as neighbors are suitable for many fish. They have a calm disposition, an interesting body color, and bring a lot of benefits. If the rooster does not eat the food, the corridor will pick it up. Somiki swim at the bottom of the aquarium, cockerels at the bottom only sleep. Compatibility between them is proven, cockerels rarely bother corridors. The corridors, like labyrinths, can use atmospheric air for breathing. Such a pet can survive under critical conditions. Somiki poorly tolerate salt and organics, as well as betta. Replacement of water in the general aquarium should occur once a week.

Type of aquarium fish and compatibility of different species (table)

Getting a pet store, the newcomer is just lost - so many fish, they all like it in their own way, I want to settle in the new aquarium as many handsome men as possible. But the choice of neighbors has its own subtleties. Let's consider how aquarium fish are compatible with each other.

Species compatibility

The species compatibility table clearly shows which animals are fully compatible with each other, incompatible, or partially compatible under certain conditions. Consider the principles on which the table is built.

  1. Conditions should be well suited for all inhabitants of the aquarium.
  2. You can not put together a predator and prey.
  3. Type of aquarium fish with a calm and sluggish nature should not coexist with fast and active fish. They'll starve and get stressed.
  4. The inhabitants of the aquarium should be proportionate. Even the most peaceful fish will eat everyone who fits into her mouth.
  5. Some fish show aggression and can attack both neighbors and members of their own species. It is necessary to take into account the particular behavior.
  6. One type of aquarium fish can not live without a flock of their own kind, the other - without a pair, and the third prefers loneliness. This should not be forgotten if you want to avoid fights or stress.

So, consider what types of aquarium fish are, some aspects of their content and compatibility. In one article it is impossible to describe all types of fish, so we will focus on the most popular representatives and the general characteristics of groups.


Apistogram dwarf cichlids are popular species of aquarium fish. Photos show that these little fish look like bright tropical butterflies. Apistograms do not need a large amount of aquarium, plants do not damage and are quite calm. They can be kept with other peaceful fish - sword-bearers, patzilia, guppies, mollies, neons, rassets, tetras, small catfish, barbs. But small shrimp will be happy to eat even dwarf cichlids. Males apistogramm in a small aquarium will be aggressive to each other, so you can keep a couple or a harem.

Another popular type of aquarium fish is the scalar. These fish are also thermophilic, do not destroy plants. But they will eat up all the small neighbors (neon, rasbor), and the aggressive fish will cut off their beautiful long fins (crests, denison, many types of barbs). For these reasons, the list of neighbors is small - unhurried gourami, mollies, petilles, cherry barbs, some soma.

The kings of the freshwater aquarium - the discus - are very demanding to the conditions and nutrition of the fish. In addition, the preferred high temperature - 28-31 ° C. Far from all plants and animals can withstand such heat. They are compatible with discus: catfish tarakatum, clown combat, Ramirezi's apistogram, red-bearing tetra, red neons. Discus gentle fish, prone to stress and various diseases, so it is better to abandon any neighbors.

As for other types of cichlids, such as the parrot, handsome chromis, labidochromis ellou, black-striped cichlid, astronotus and others, it is difficult to pick up the neighbors. These fish are territorial, aggressive, they need shelter. They dig the ground, pull out all the plants. Two males in a small volume will constantly conflict, so you can keep them in pairs or harems, with other active fish, able to stand up for themselves. They are compatible only with other cichlids, and because of intraspecific aggression, it is better to choose neighbors with a different color.


That viviparous most often become the first pets beginners. Sword-bearers, mollies, platies, aquarium guppy fish. All types of viviparous are unpretentious in content, not aggressive, easily get along with other types of peaceful fish. In addition, a huge number of varieties and colors viviparous. More than 80 species of guppies, dozens of species of placiums, mollies, swordtails differ not only in coloring, but also in the shape of the body and fins.

Of course, in the content of viviparous there are some subtleties. Males of swordtails can be aggressive, therefore they do not recommend settling several males in one aquarium. And guppies can provoke barbs, thorns, angelfish, some gourams with their bright long tails.

Guppies - the smallest of viviparous, but larger molly, placium and swordfish can be settled with scalars, gourami, barbs. Neon, rasbora, cardinals, tarakatum, speckled catfish, corridors will be good neighbors for all.


Suitable for beginners and labyrinth aquarium fish. Species of these fish are remarkable in that they need atmospheric air for breathing. Some labyrinths are pretty jumping, so the aquarium should be covered with a lid, but with an obligatory gap. In the aquarium should be a lot of plants and shelters.

Males of males and macropods are very aggressive towards other males of their own species, therefore they need to be maintained by a harem. Conflicts between males will be with gourami, lyalius. They need a spacious aquarium and several females. All types of labyrinth females also need shelter in order to hide from harassment during spawning.

Despite the intraspecific aggression, the labyrinths get along well with other peaceful fish - swordtails, petillia, mollies, neons, rassets, zebrafish, cherry barbs, antsistrus, cardinals, speckled catfish. You can not settle with fish that love to tear off fins - barbs and ternitsemi.


It is not easy even to list all the types and names of aquarium fish of the Haracin family. They are quite different from each other - this is the well-known neon, tetra, and Khujet's rare pikes, predatory piranhas, flying blazer-belly, and huge black pacu.

Tetras, phantoms, congos, ternas are very active, peaceful fish of medium and small size. They live in flocks, so do not purchase less than 7-10 individuals. Black neighbors, tarakatums, lyalius, speckled catfish, danios, cardinals, viviparous can be neighbors for them. Some tetras like to tear off other fins to other fish, so they need to be carefully kept with their tail fin.

Black, red and blue neons are peaceful little fishes. They need to settle with a flock of 15 individuals. Because of their small size, large fish are dangerous for neons, it is better to give preference to smaller and non-predatory neighbors - rasboram, small haratsinovym, apistogramma, clipped belly, viviparous, cardinals, iris, barbs.


Botsiya-clown, tiger and marble combat - large and very active fish. They prefer to live in a flock of 5 individuals. Get along well with other peaceful fish of medium and large sizes. They can tear off the veil fins. They eat plants and snails.

Botsi stay mostly at the bottom, occasionally rising in the middle layers of water. Therefore, it is better to supplement their company with fish that live in the upper layers. Good neighbors for fighting can be barbs, angelfish, danios, gourami, viviparous, rasbor, iris, labo, tetra.


Cherry barb is the most peaceful type of aquarium fish among its relatives. It will easily get along with small fish, but large and predatory neighbors can easily offend him. They contain a barb by a flock of 5 individuals, in the company of neons, rasbor, cardinals, danios, corridors.

As for the other types of barbs - Sumatran, fire, mutants, they are known as hooligans and bullies. Active fish that will not be offended will approach them as neighbors - danio rerio, ternets, congas, tetras, tarakatums, speckled catfish, cardinals. Fish that have long fins that will annoy barbecues - goslings, hyalus, will not work.


Danio - active small aquarium fish. Compatibility of species - the table shows that due to its size and peaceful nature, danios get along well with many fish. To keep them you need flocks of at least 5 individuals.

The list of good neighbors for danios is really extensive - viviparous, cockerels, angelfish, gourami, fighters, iris, rasbor, labo, tetra. All peaceful fish of small and medium size, which will not offend danios, are suitable.


Labo bicolor is often recommended as a calm fish for a common aquarium. But it is not. The young labo will be shy and shy, but an adult will begin to protect its territory and attack fish that resemble their relatives. Several laboos will invariably conflict. Fast fish that live in the upper layers of water - danios, thorns, barbs, can live with him. Green Labo will also be able to temper his aggressiveness if he has his own territory and shelter, which he will defend.

It occurs in our zoomagin and black labo. This fish does not tolerate their relatives, aggressive and territorial. It grows up to 80 cm in length and needs a large volume aquarium. It can live with large fish, for example, with the red-tailed catfish. But conflicts are not excluded.


Another pets for beginners - goldfish. Aquarium species of these fish are very common. If you look at the compatibility table, the line devoted to goldfish will be completely filled with red, with a few yellow areas, just like many cichlids. But if cichlids are aggressive, then goldfish often become victims themselves. Goldfish are large, and little things like rasbor and neon, they gradually eat. And the other inhabitants of the aquarium themselves can offend the slow and delicate little crowns with long fins.

Golden fish is best to settle with their own kind, there are enough interesting varieties of this breed. It should not be forgotten that if you want to get offspring, then you cannot keep different species together. Who do goldfish can get along with? Aquarium species of calm catfish - the Tarakatum, fighting-clowns, corridors, peaceful tetras - Congas, terntions and calm danios will be fine. There are also examples of successful cohabitation of gold with neons, scalars, viviparous, but we must remember that any neighborhood of goldfish with other species may result in conflicts and death of the inhabitants of the aquarium.


The bottom is occupied by aquarium fish - catfish. Types of catfish are very diverse, they differ both in size and behavior. Consider the most common.

Shy platydoras will surely eat all the fish that fit into his mouth. Therefore, it can only be maintained with large fish, for example, cichlids.

Most often in an aquarium live ancistrus. Several antsistrusov can be kept only under the condition of a large aquarium, these fish are territorial. But to other species they are not aggressive, and very few people touch them either.

The corridors are another popular catfish species. They are kept in a group of at least 3 individuals, if they are eaten by space - 10-15. Fish are peaceful, but their large fish can eat. Ideal neighbors for corridors are tetras, rasbaras, danios, viviparins, dwarf cichlids. They do not like water with a temperature above 25 degrees, so it is not suitable for content with thermophilic species.

Tarakatum has a peace-loving nature and can coexist with peaceful fish and even with other catfish.

Red-tailed catfish can often be seen in pet stores, but this fish is not suitable for a common aquarium, as it grows very large - up to a meter, and simply eat all the inhabitants. It can live with commensurate fish, but the aquarium for a group of such large fish must be very large - from 1000 liters.

Glass catfish is well suited for a general aquarium, it can live with commensurate and small fish - neon, ramming, small gurus, Ramirezi apistogram, catfish. Large fish are dangerous for this peaceful catfish.

Pterigoplichts grow large, so neighbors must be matched - large cichlids, giant gourami, fish knives, polypteruses.

Who do you have guppies with?

A typical question for aquarists who are going to keep Poecilia reticulata (Guppy) in the general aquarium is: "Which fish get along with guppies?" It is important to avoid settling with predatory fish, such as the red-tailed shark, Sumatran barbs, scalars, large cichlids, eels, and mastembela. The best aquarium neighbors for small viviparous fishes (3-7 cm) are small fish with a peaceful nature.

Fish that are suitable for settlement with Poecilia reticulata

There are a large number of freshwater aquarium fish that can live with guppies in peace and harmony. The listed types are the safest options. They mate with these viviparous Pecillians in terms of similarity of living conditions and behavioral characteristics.

Somiki corridor - relatively slow swimmers, almost always in the lower layers of the aquarium. They are characterized by small body size and calm disposition, they gradually clean the aquarium from food debris. Guppies swim in the upper and middle layers of the water, so the corridors will not hook them. However, one should not add salt to the water in which catfish live (and the pets-liqueras love such water), otherwise they will die.

See how guppies and catfish corridor dwell in the same aquarium.

Indian glass fish, or Malaysian glass - it is often confused with glass catfish, but they are completely different species. The glass is a peaceful and rather hardy fish, they are excellent companions for guppies and other small tropical fish. The transparent body of the body makes them unique, they even shine through the skeleton and internal organs. Malaysian glass is characterized by gregarious behavior, swims in a group of 5-7 fish. It is not recommended to buy fish with a fluorescent color. Just "painted" glass fish are more sensitive to the parameters of the aquatic environment, and during the disease color pigment can open wounds, causing infection in the water.

Mollies, patcilia, swordtails - viviparous fish of the Family Petsilievye, which are best compatible with guppies. All fish are related species, in the general aquarium they can breed, bringing hybrid offspring. Guppies, mollies and platies will not conflict with each other. But swordtails, especially adult males, can terrorize the tail fish, so it is better to settle with "swords" fish with short fins. Mollies prefer to live in a pair. If in a spacious aquarium will live a couple of moles and a few guppies, you get a great neighborhood.

Neon tetra - the most popular freshwater and tropical fish. You can keep with any peaceful species of fish, it is even called "pearls of the aquarium." Neon tetras are characterized by a rosy blue body with a reddish tinge. They create a strong flock of 6-10 individuals, and calmly swim in the upper and middle layers of water. Can make an excellent company viviparous fish, without disturbing them.

Rasbory - differ in metallic color scales, they are clearly visible, which simplifies the care of these fish. Hardy, peace-loving, swim in a flock of 6-8 fish. They can be settled with guppies in the general aquarium, as their characters are perfectly compatible.

Dwarf loaches - like all loaches, they are very peaceful fishes. However, some types of char can grow larger in size compared to guppies.Dwarf loaches remain small all their life, rarely grow to a length of more than 5 cm, so that they are commensurate with petilia fish. They like to swim in a flock, so settle them immediately with a flock of 3 individuals. You can build a few shelters in the aquarium, add live plants, because these loaches like to hide and rest.

Endler Guppy (lat. Poecilia wingei) - used to believe that Endler's viviparous fish are relatives of Poecilia reticulata. Later it turned out that these are different species, although both come from Central America. There are certain similarities between species; they can interbreed in the same aquarium. Viviparous endlers are suitable for tropical aquariums, where different viviparous petsilievy live. It should be borne in mind that the Endler fish grows up to 3.8 cm in length, therefore it cannot be accommodated with larger species. Settle them immediately for 6-8 individuals and more, create shelters for them, otherwise they will be eaten. Poecilia reticulata will ignore them, but under proper conditions of detention.

Observe laliusi, neons, catfish and guppies in the general aquarium.

General rules for compatibility with guppies in home aquarium conditions

When choosing a fish for a community with guppies in an aquarium, you need to know some general rules that you should follow:

  1. In the tank you can keep the fish only with a similar temperament and behavior. Males guppies usually have long and lush fins, so those neighbors who can pluck them should not live with them. Guppy is not compatible with aggressive, fast types, otherwise stress and physical exhaustion of victims cannot be avoided.
  2. Diet and water requirements - be sure to choose fish that prefer the same food and water conditions as guppies. Check the pH, hardness, temperature of the water environment.

  1. It is better to keep all the fish in a spacious tank with enough space for swimming and shelter. On one fish should go on average 50 liters of water.
  2. The proportionality of the fish - Poecilia reticulata are considered small fish, so it is desirable to keep them with the same neighbors. Large "comrades" are seduced by the size of defenseless guppies, they can eat them, or take food from them.
  3. Small bottom fish species can be kept with viviparous Guppy, which rarely swim to the bottom.

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.

What kind of fish don't need air?

What fish can live without oxygen? In fact, these fish do not exist. Like any living creature, they need a constant flow of liquefied or atmospheric O2. Usually fish breathe with the help of gills, which in each species of fish differ in size and shape. Gill slits are located on the sides, there are 4-5 pairs. The water that passes through the gill petals, gives up dissolved oxygen, and carries away the released CO2, then oxygen enters all parts of the fish's body. Another thing, if we are talking about oxygen from water or the atmosphere.

Two-headed fish species

Some fishes are capable of living not only in water, but also on land, among them are relict representatives of the family Mnogoperovye (polyterus, kalamoiht, Nile mnogoper). Due to the special structure of the swim bladder, they are able to capture air from the atmosphere and breathe it for a long time, so they periodically live on land.

Watch a video about the Senegalese polypterus.

There is a family of fish that need atmospheric oxygen - this is Macropod. These are the well-known aquarium liliusi, gourami, cockerels, colises, nitropods. Some members of this family have a unique labyrinth organ that allows you to inhale and dissolve atmospheric oxygen.

In addition to these species, there are representatives of other families of hydrobionts, which can get portions of air into the intestines. These include speckled catfish corridor, gaining O2 in the anus. Intestinal breathing allows you to accelerate in the water due to a portion of air, so you can periodically observe how these fish quickly rise up and back down.

Oxygenated aquarium aerator

Since there are no such fish that can live without oxygen, it is necessary to figure out, but do “two-breathing” hydrobionts need any special conditions? Yes, and the main condition - mandatory aeration in the aquarium. Such inhabitants can live in an aquarium in which there is access to atmospheric and diluted O2 in water. Gathering on a long trip, an aerator is also needed to save the lives of these pets. The gap between the aquarium cover and the surface of the water should be slightly open so that they can breathe in their portion of air.

How do medications and elevated temperature of water affect the supply of oxygen?

When the fish are sick and sitting in quarantine, drugs can save them from the disease. However, instead of adding drugs, it is often necessary to raise the temperature of the water so that the fish become healthy. This applies to heat-loving tropical species, which become lethargic and weak due to the decrease in temperature in the reservoir. As a rule, when adding drugs, they increase aeration, since substances block oxygen supply to water. Therefore, the presence of a good filter is an additional help that will help the exchange of oxygen around the water perimeter.

Increased temperature also limits the flow of oxygen into the water, so aeration should be enhanced. This is important for cold-loving fish and amphibians that need oxygen. Powerful aeration and lowering the temperature of the water in the aquarium to the permissible rate will quickly eliminate the problem.


If the filter does not mix all layers of water, then it must be adjusted so that it has more turbulence. In this case, you can add an aerator. The so-called internal filters are located on the back wall of the aquarium, have strong power, pushing oxygen into the water. But canister aquarium filters need to be configured so that water is pumped and mixed on the surface. Bottom filters do not saturate water with oxygen, so the pump is attached to them. Spongy dry and wet aqua filters well saturate the water with oxygen, mixing the water, and therefore more acceptable.

Watch a video about aquarium sprayers.

What to do if you have to transport the fish over a long distance?

During the forced travel to long distances with fish, you have to take risks. Adding an aerator to the carry is vital. It will provide the fish with enough dissolved oxygen, and relieve them from stress. You can buy a battery aerator / pump that will last a long time. They sell the power supply, so do not have to worry about its performance.

Signs that determine that fish need more oxygen

If the fish often begin to take air from the surface of the water, even those that spend most of their lives in the lower layers of the aquarium, this is an alarming signal. They really need oxygen dissolved in water. What measures to take in this case? First, measure the water for ammonia, nitrite, and nitrate. If the amount of harmful contaminants is increased, replace 40-50% of the water with clean, fresh and acceptable parameters. Do not pour out all the water, it is detrimental to the lives of pets. If indicators of ammonia and nitrates, nitrites are normal, then increase the aeration and add air stones to the water.

Air stones - what for and for whom?

Air stones are commonly used in a water filtration system, there are various types of such stones, of different shapes and sizes. They are necessary for fish that breathe a labyrinth organ, saturate the water with additional oxygen. Small stones float on the surface of the water due to the light and floating composition. Stones with high weight can be placed at the back wall of the aquarium, additionally decorating it.