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What to do if fish die in an aquarium

Aquarium fish can die for various reasons. The most common are drastic changes in water parameters, disease, and body wear. The detrimental level of oxygen in the water affects the health of the fish. In this case, the fish are at the surface of the water, and capture the air. If the problem is not solved in time, the pets will die. Unfortunately, there are a number of reasons why domestic fish can die.

The level of oxygen in an aquatic environment depends on the temperature of the water (in warm water, a low concentration of dissolved oxygen), chemical indicators, a bacterial film on the surface of the water, outbreaks of ciliates and algae. Water problems, intensive aeration will help to solve the problem. Fluctuations of the surface layer of water play a leading role in the gas exchange of a closed space.

Common causes of death of aquarium fish

  1. Water of inadequate quality (dirty, turbid, toxic). The likely cause of death is poisoning with nitrogenous compounds that are formed after the collapse of fish waste. Improper water purification leads to the fact that nitrites, nitrates and ammonium as toxic substances quickly spread in the water. The correct nitrogenous cycle is a guarantee of the health of all pets. But if the water is poisoned by nitrogenous compounds, it becomes turbid, the smell of rot will appear. The dissolved ammonia can be in a reservoir in high doses at a pH level of 7.5 and above. At lower pH levels, ammonium is not so toxic, but it can harm small fish. Fish die from poisoning with this substance.

  2. Wrong conditions of the settlement of fish, too fast adaptation. Water in a pet store and in a home tank can vary in many ways. If the fish instantly settle into the water of a different pH level, hardness, temperature, with a difference of one unit and more, then they die within 24 hours or one week. It is advisable to take water from the store aquarium in a portable package, and pour it into a separate container. It is necessary to add water from the main reservoir in portions, not more than 5% of the total volume, at intervals of 10 minutes. Fish can be transplanted into the aquarium after the part of the aquarium water in the tank becomes higher than 60-75% of the total volume.

    See how to properly transplant aquarium fish.

  3. Gas embolism is a disease that can lead to the sudden death of a fish. On the eyes, the body can be seen capillaries, the body turns red, the fish swims from corner to corner, the body is covered with air bubbles, the scales are tousled. The disease is the result of a sharp replacement of water (more than 50%), or the settlement of the pet in the water, recruited directly from the tap.

  4. Illness is another reason why fish die. Often the symptoms of the disease are visible immediately by the behavior of the fish and its appearance. Diseases are the result of a weak immune system, stress, infection. Without solving problems with water, even drugs do not always eliminate the problem. Some treatments may not be suitable, and may lead to poor health. For example, salting water for medicinal purposes is impossible if the fish are poisoned by nitrates. Therefore, if you buy a new fish, leave it for a 2-4 week quarantine so that it probably does not bring the disease to the general aquarium. After quarantine, healthy fish can be launched to other fish.

What to do if you find a dead fish in the walls of the aquarium?

  1. Look at the number of fish in the tank. Recount them in the morning and in the hours of feeding. What is their condition, do they take good food? Are there fish that refuse food? Is bloating in one of the fish possible? If you have not found any fish, check all the corners in the aquarium by lifting the lid. Inspect the plants, caverns and all the scenery. If after a few days the dead fish did not float to the surface, it may have suffered from a neighbor in the aquarium, and you can hardly find it. Sometimes the fish fall into an unprotected filter, and die there. In any case, keep searching until you find the visible reasons for the disappearance.

  2. Fish that have died in an aquarium should be removed from it. Tropical species of fish quickly rot because of high water temperature. Under conditions of such an environment, bacteria multiply rapidly, water grows turbid, and an unpleasant odor appears, which can cause infection of other pets.
  3. It is necessary to do an inspection of a dead fish. You must understand why she died in an aquarium. Wear medical gloves. If the body is not completely decomposed, look at the condition of the fins, scales, and condition of the abdominal cavity. Perhaps there are wounds on the body or signs that she has suffered from unproductive neighbors. If the stomach is strongly swollen, eyes bulging, the scales are covered with bloom or stains - it means that the pet has suffered from illness or poisoning. After inspection, gloves should be discarded.

  4. Check the water parameters. Water is often the main cause of poor health. Take tests with indicators, and make the necessary measurements. The increased content of ammonia and nitrates in water, heavy metals leads to the fact that pets die quickly. If the aquarium has a decorative element made of iron, zinc, copper - this is another pointer. Some fish do not tolerate metal, and suddenly die.

    Watch a video on why water tests are needed and how to use them.

  5. After the test results, draw conclusions. The test will show two results - either you have everything in order in the aquarium, or the water is dirty and there is an overabundance of toxic substances in it. In the second case, you need to enable powerful filtering, and make a replacement of 25% of the aquarium water for clean and infused. Dramatically change the parameters of the water is not necessary, it can harm living fish.

  6. But if the water is in proper condition, there may be a number of other reasons why the fish died. Sometimes aquarium pets die of hunger, overeating, illness, severe stress, bruises after attacking other fish, age. If the fish die suddenly, you need to do everything necessary to keep others alive. Contact your veterinarian if you do not find obvious causes of death of the pet.

Why die fish in an aquarium and what to do.

It is very unpleasant when the fish begin to die in the aquarium. It would seem that everything was done correctly: clean water was poured, aquarium equipment was working, the fish received timely feed. Despite this, the animals die. Unfortunately, this situation occurs in newcomers of the aquarium business quite often, which is why it is necessary to arm yourself with knowledge of the causes of this phenomenon.

Each novice aquarist should understand the following in advance: if conditions are created in the water house for its inhabitants that are as close as possible to their natural habitat, then they will not get sick, much less die.

At the very least, the risk of death will be minimized.

Practice shows that in the overwhelming majority of cases, the death of fish is caused not by any external diseases, but by errors in content, illiteracy and carelessness of their owners. There are various reasons for this unfortunate phenomenon or a whole combination of causes and factors that should be considered in detail.

Nitrogen poisoning

Nitrogen poisoning is the most common problem. It often concerns beginners who have no experience in dealing with aquarium animals. The fact is that they are trying to feed their pets to the dump, forgetting that with this increases the amount of waste. By the simplest calculations, each fish per day leaves feces equal to 1/3 of its weight. However, not everyone knows that in the process of oxidation and decomposition nitrogen compounds appear, consisting of:

  • Ammonium;
  • Nitrate;
  • Nitrite.

All these substances are united by their toxicity. The most dangerous of them is ammonium, the excess of which will be the main cause of death for all inhabitants of the reservoir. This happens most often in newly launched aquariums. The first week after the start becomes critical. There are two options for increasing the amount of these substances in aqua:

  • Increase in the number of inhabitants;
  • Breakage of the filter;
  • Excessive feed.

It is possible to determine the surplus by the state of water, more precisely by smell and color. If you noted the darkening of the water and the smell of rot, then the process of increasing ammonium in the water is started. It happens that when visually inspected, the water is crystal clear in the house for fish, but the smell makes you wonder.

To confirm your suspicions, ask special chemical tests at pet stores. With their help, you can easily measure the level of ammonium. True, it is worth noting the high cost of tests, but for a novice aquarist they are very necessary if you do not want to lose all your pets for a couple of days. If time corrects the situation, then the death will be avoided.

How to lower the level of ammonia:

  • Daily water change ¼
  • Water should stand at least a day;
  • Check the filter and filter element for serviceability.

Water temperature

The death of fish can also occur due to a decrease or increase in temperature of the aquatic environment. The opinion that a deviation from a certain temperature mode by 2-3 degrees in one direction or another will not affect the health of aquarium pets is deeply mistaken.

If the temperature drops, there is a danger of dying from a cold, and as it rises, the fish may die from lack of oxygen.

Lack of oxygen as a negative factor

A fish is known to breathe air dissolved in water, and it can suffocate if it is too little in aqua. Although such cases are very rare, they do happen.

As a rule, even beginners pre-acquire all the equipment necessary for the operation of the home aquatic system.

And very often, buying a powerful enough filter, they trust him not only with water purification, but also with its aeration and mixing.

Still, experts recommend to separate these two functions and ensure the continuous operation of the air compressor

Fish diseases

No one wants to blame himself, so beginner breeders blame the disease. Unscrupulous sellers only reinforce their doubts, because they have a goal to sell expensive medicine and cash in on. However, do not rush for a panacea, carefully examine all possible causes of death.

Blame the disease is possible only if the symptoms have been noted for a long time. The fish died away gradually, and not just died in an instant, for no apparent reason. Most often, the disease is brought to the aquarium with new residents or plants. Death may occur due to malfunction of the heating element in cold weather.

Going to pet stores, you should be aware of what exactly you need medicine. Each of the drugs directed to a specific disease. Universal drugs do not exist! If possible, consult an experienced aquarist or ask a question on the forum, knowledgeable people will tell you what to do in this situation.

Of course, the disease can not kill a healthy fish. Why die fish in an aquarium? If the death occurred, then the immunity has already been undermined. Most likely, the first two errors occurred. Do not rush to launch new residents, no matter how beautiful they are.

What to do to protect the aquarium:

  • Organize quarantine for new inhabitants;
  • Sanitize fish or plants.

What to do if the disease started up in the aquarium:

  • Change one tenth of the water daily;
  • Increase the temperature;
  • Strengthen aeration;
  • Remove the carriers of the disease and those who are clearly infected.

Remember which fish you ran at home last. Individuals brought from other countries can be carriers of rare diseases, and it is sometimes impossible to detect and classify on their own.

O2 deficiency

This option is the rarest of all. Oxygenation of a fish house is always adequately assessed even by beginners. The first thing they do is buy a compressor. With him, not terrible choking fish.

The only possible option is to increase the temperature and, as a result, lower oxygen in the water. This can happen at night, when the plants are rearranged from the production of oxygen, to its absorption. To avoid this, do not turn off the compressor at night.

Aggressive neighbors

Before you go to the store for pets, think over to the smallest detail, can there be several species in one fish house? You should not rely on the competence of the seller, since the main goal for him is to realize as much of the goods as possible.

A few fundamental rules:

  • Big fish always tend to eat small ones (even in the case of herbivorous species);
  • Many succumb to intraspecific aggression;
  • Some are able to stick to small neighbors, which ultimately leads to death;
  • The strong always eat the weak;
  • Buy only those fish whose peace-loving nature you are sure of.

Unfortunately, it is impossible to establish why fish die. The death of a pet can happen even to experienced breeders. Be attentive to the fish, and you will definitely notice a change in behavior and in time eliminate the cause of anxiety. More often, fish die in an aquarium because of an oversight, and not according to other criteria.

What to do if you find a dead fish in the walls of the aquarium?

  1. Look at the number of fish in the tank. Recount them in the morning and in the hours of feeding. What is their condition, do they take food well? Are there fish that refuse food? Is bloating in one of the fish possible? If you have not found any fish, check all the corners in the aquarium by lifting the lid. Inspect the plants, caverns and all the scenery. If after a few days the dead fish did not float to the surface, it may have suffered from a neighbor in the aquarium, and you can hardly find it. Sometimes the fish fall into an unprotected filter, and die there. In any case, keep searching until you find the visible reasons for the disappearance.
  1. Fish that have died in an aquarium should be removed from it. Tropical species of fish quickly rot because of high water temperature. Under conditions of such an environment, bacteria multiply rapidly, water grows turbid, and an unpleasant odor appears, which can cause infection of other pets.
  2. It is necessary to do inspection of the dead fish. You must understand why she died in an aquarium. Wear medical gloves. If the body is not completely decomposed, look at the condition of the fins, scales, and condition of the abdominal cavity. Perhaps there are wounds on the body or signs that she has suffered from unproductive neighbors. If the stomach is strongly swollen, eyes bulging, the scales are covered with bloom or stains - it means that the pet has suffered from illness or poisoning. After inspection, gloves should be discarded.

  1. Check the water parameters. Water is often the main cause of poor health. Take tests with indicators, and make the necessary measurements. The increased content of ammonia and nitrates in water, heavy metals leads to the fact that pets die quickly. If the aquarium has a decorative element made of iron, zinc, copper - this is another pointer. Some fish do not tolerate metal, and suddenly die.
  1. After the test results, draw conclusions. The test will show two results - either you have everything in order in the aquarium, or the water is dirty and there is an overabundance of toxic substances in it. In the second case, you need to enable powerful filtering, and make a replacement of 25% of the aquarium water for clean and infused. Dramatically change the parameters of the water is not necessary, it can harm living fish.
  1. But if the water is in proper condition, there may be a number of other reasons why the fish died. Sometimes aquarium pets die of hunger, overeating, illness, severe stress, bruises after attacking other fish, age. If the fish die suddenly, you need to do everything necessary to keep others alive. Contact your veterinarian if you do not find obvious causes of death of the pet.

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Why fish die in an aquarium :: why fish aquarium die :: Other pets

Why fish die in the aquarium

The causes of death of aquarium fish can be many. Ideally, the environment in the aquarium should be as close as possible to the natural habitat of the species of fish that you settled in it. If there are any deviations, it can lead to health problems and even the death of your pets.

The question "Plots turtle." - 3 replies

Aquarium fish should be provided with perfectly clean water, the aquarium itself should be well lit and filtered. And, of course, we must not forget about feeding and live plants. It would seem that to fulfill these requirements is quite simple, what can go wrong? Most often the fish die as a result of the following violations.

Main reasons


The first reason - poor-quality water. If you do not clean your aquarium often enough, then the waste products of the fish disintegrate and poison the water with nitrogen compounds. During the day, the fish accumulate a huge amount of feces - up to a third of its weight.In addition, do not overfeed your pets, otherwise the uneaten food will begin to decompose. Unfortunately, many novice aquarists are poorly oriented in such matters and completely forget about timely cleaning. Nitrogen compounds, such as ammonium, nitrate and nitrite, make themselves felt unpleasant smell and muddy
The second reason is the wrong adaptation of the purchased fish to new conditions. The problem is that the water in pet shops aquariums and the water in your home can vary dramatically in terms of pH, temperature, hardness. You can not just take and throw a newly acquired fish in your tank, it can experience shock. It is necessary to attach a bag with a new fish to the glass of the aquarium, install weak aeration and pour aquarium water into the bag every 10-15 minutes. After an hour and a half, the water from the package can be poured into the sink, and the fish run into the aquarium. In the aquarium for a better adaptation of new fish, it is desirable to add a special anti-stress drug

What does the wrong content lead to?


The third reason is quite common - various diseases. But It is worth noting that the disease option should be considered only when the possibility of contamination or maladjustment is excluded. And here it is necessary to make a reservation that the fish get sick because of the reduced immunity caused by adverse conditions. If one fish has died, or the sea has begun, you need to consult with a specialist who is not interested in selling expensive drugs. For the prevention of disease, take care of the fish, and place the diseased and recently acquired imported animals into quarantine.
Finally, you should list the adverse factors that may adversely affect the health of your fish, which can lead to death. These factors include tap water, a heater that broke down in winter, a lack of oxygen, and finally, aggression from other fish.

Related videos

Why die fish in an aquarium?

Most of the inhabitants of the aquarium needs careful maintenance. This concerns the quality and composition of water, neighbors and vegetation. If the fish began to die in an aquarium, the necessary conditions for keeping were most likely not met. To avoid such troubles, it is worthwhile to familiarize yourself with the list, which lists the most common causes of death of fish.

Why die fish in an aquarium?

  1. Like all the abodes of our planet, the fish need air, they need aeration of water. Always check the cleanliness of the air and water before settling. Fish often die in the aquarium from the lack of oxygen. This happens when you have settled many inhabitants in too small an aquarium.
  2. But even with the observance of all the rules, sometimes the fish die immediately after settling. This is due to the fact that they have a simple shock of adaptation. That is why it is impossible to release a pet into the general aquarium right after the purchase.
  3. The next reason why the fish die in the aquarium is the introduction of a disease. As a rule, you will notice a gradual deterioration of the condition of the fish, and the disease will mainly spread to one species.
  4. Never neglect the aquarium lighting. This is especially true for lovers of variegated tropical species. Light day for such fish should last about 12 hours. With a lack of light, the pet's biological clock will break, leading to death.
  5. The temperature of the water is no less important than its composition. It is believed that a couple of degrees will not be able to significantly affect the state of the aquarium inhabitants. Meanwhile, the fish are very sensitive to the slightest temperature changes, so that constant fluctuations in degrees can become a serious threat.
  6. Fish die in the aquarium if they do not follow the recommended composition of water. When buying a new species, be sure to carefully study the water characteristics that are recommended for it. Water hardness directly affects the condition of the pet, if the water is too soft or hard, it is almost a guarantee of death.
  7. Quite often, problems begin with the settlement of incompatible species. This statement is true for both carnivorous and herbivorous species. And sometimes only one species of fish dies in the aquarium, while the others feel quite normal. It is likely that there have been changes in the composition of the water, which for some fish are insignificant, and for others have caused the death.
  8. If the fish die in the new aquarium and at the same time all the water parameters and selection rules are observed, you should pay attention to the feeding regime. Newbies often only get along with dry food and just throw a handful of pellets. After a time, from such a regime, the fish have got enough stomach inflammation and they die en masse. In fact, your pets need a varied diet. Add vegetable and live food to the menu.

Why do fish die in an aquarium: forewarned is forearmed

To avoid such problems, it is necessary to take the content and maintenance of the aquarium seriously. Before you go in search of fish, do not be lazy to read enough literature about the features of their content. Often we try not to follow such a simple rule and simply find out the details in the pet store.

Most often the reasons why the fish die in an aquarium are associated with impaired content. Always keep on control all the parameters of the water in the aquarium, track any changes in the behavior and condition of pets. These simple rules will allow you to notice the beginning of the problem in time and solve it in a short time. Fish can not tell you, but in her behavior you will always notice something was wrong.

Why do the fish lie on the bottom?

If you notice that your fish is lying at the bottom of the aquarium, do not despair - this does not mean that she is sick, or is about to die. Look at it, maybe it does not lie at all, but swims and studies the bottom, or digs up the soil. Why fish often sinks to the bottom of the reservoir, and what the reasons may be for this - should be considered in detail.


Natural behavior

For some species of fish, lying on the bottom is a natural behavior. If a speckled catfish lives in your aquarium, or another type of corridor, you will notice how it floats in the bottom layer of the reservoir. It's not scary, just all the corridors, and catfish, too, live only in the lower layers of water. As natural cleaners, they take uneaten food from the ground, scraping algae that have accumulated on its surface from the bottom.

Other species of fish also swim in the lower layers of the water - these are neons. As representatives of the Kharacin family, they are distinguished by their small size and sensitive body, which will irreversibly suffer with any damage. The safest place for them is the bottom of the tank, where they will be comfortable and safe.

Look at the unusual behavior of the surgeon's fish.

You can see how the fish of the family of Viunovye and Tsikhlida often spend time at the bottom of the reservoir. As you know, they love to dig in the ground and dig water plants. For them, there are other forms of "entertainment", but they are used to this lifestyle. There are no signs of illness here, they are simply looking for something, perhaps food, or cleaning the body of accumulated mucus. For loaches, it is important to free the scales from mucus, wallowing in stones or gravel — otherwise, one cannot avoid inflammation of the skin.

Many fish swim at night at the bottom of the aquarium. Why is this happening? Everything is simple - this is normal. Like many living creatures, fish prefer to sleep at night, although there are exceptions. They slowly drift in the bottom layers of the water, often with open eyes. And if they swim to the surface, then some pets can even be stroked.

Natural behavior - to be in the bottom water layers, when the fish recently settled in the general aquarium. For her, this is a new, unknown world that hides a potential danger. The adaptation process takes place in a secluded place where it is likely not to be noticed. This behavior is typical if you have settled goldfish, tsikhlidki, kartozubye or labyrinth.


When does a fish suddenly swim to the bottom?

Now it is necessary to understand the reasons when a fish that does not live in the bottom layers of water swims in the “bottoms”. Pay attention to how much food you give to fish - if your pets overeat, their stomach does not have time to digest all the food, and there is heaviness in the stomach. It is easier to move your stuffed belly to the bottom without rising higher. Overeating is followed by obesity, which is deadly for pets. Reduce feed to a minimum, and put the fish on a fasting diet.

Another reason for this strange behavior is a disease of the gallbladder and the digestive organs. Usually they are accompanied by other symptoms. For example, during infectious diseases, the fish begin to experience changes in the gastrointestinal tract. The fish is weakened, and begins to sink to the bottom. In case of hexamitosis, single-celled bacteria settle in the gallbladder of the fish, which aggravate its work. As a result, inflammation of the gallbladder, blockage of blood vessels and death will occur. Time to diagnose the disease and begin to treat pets.

See how the fish has a swim bladder problem.

If the fish after the fight, or after active underwater games was on the bottom - examine her body. Perhaps she was injured and could not move. Unfortunately, such cases are almost incurable, but you can contact a specialist who can help. Large fish are better wounded than small ones.

Pay attention to the condition of the water - perhaps you forgot to clean the aquarium? Remember, when was the last time measurements were made of the parameters of the aquatic environment: temperature, acidity, hardness, the presence of nitrites and nitrates, ammonia and chlorine. If you find a violation - immediately correct. Under the wrong conditions, the fish sometimes swims on the bottom, and will wait for the moment when the water gets better.


The breakdown is another reason for such uncharacteristic behavior. If the water is excessively warm (above 25 ° C), some species of fish (for example, goldfish) may be in the bottom layers, which is unusual for them. They will look for cooler water, which is exactly in the lower compartment of the tank. However, prolonged exposure to cool water can cause hypothermia, loss of strength, with concomitant health effects. Gradually heat the temperature of the reservoir to normal, then the pets will begin to swim higher.

Has your fish started to swim to the bottom and rub your body against gravel, rocks or sand? This is a clear sign of illness. Ichthyophthyriosis (semolina), holodonelez, trikhodiniosis - these are parasitic diseases in which fish with scales begin to rub against stones, bottom plants or decorations. Immediately place the fish in a quarantine chalice, and begin to heal them.

And the last reason why the fish is at the bottom and can not rise - it is preparing for death. Before death, she can hide, behaves apathetic and indifferent to what is happening around. For the old fish is a habitual behavior. In this case, try not to panic, and in time remove the dead fish from the aquarium before decomposition.

Why do my fish die massively in my tank? ...

ARKHIPOVA SVETLANA

. Support for fish habitat settings. You need to check the water temperature every day and if you need to turn on the heater, also make sure that the filter is not clogged, so that the compressor works, and if necessary turn on the backlight.
If there is a need to add water to the aquarium, but it must be defended. It is contraindicated to put into the aquarium various foreign objects that are able to release into the water of various kinds of substances. In the room where the aquarium is better not to smoke, because tobacco smoke is harmful to fish.
2. Feeding. It is best to feed the fish once or twice a day if they are adults, and the fry are more often four times. Frequently satisfied beginners aquarists do not know how much to feed. In order to establish the exact amount of feed needed directly by your fish you can empirically. You just pour the amount of food that they can eat in 5-10 minutes. It is better to clean up all residues immediately, because they pollute the water in the aquarium. Not allowed accumulation of food at the bottom. It is better not to overfeed fish. Feed is either frozen, or "live", or dry.
Dry food is most often produced on the basis of dry daphnia or dry mixes. To "live" feed include: tube maker, bloodworm, duckweed. And frozen food, before giving them the fish need to defrost. A variety of food, no doubt, is useful for you and your fish. Food should be distributed in the aquarium in such a way that everyone gets it - both strong and weak, and also to those who are always at the bottom.
3. Verification. Every day you should check the condition of the fish and plants in your tank. If you see any signs of decomposition of plants, they should be urgently thrown out. As for the fish, if they have signs of disease, and these are growths or suspicious spots, they should be immediately transferred to the quarantine aquarium so as not to infect other inhabitants of the aquarium. Only a specialist will tell you how to treat a sick fish, you yourself are unlikely to determine what exactly the fish are sick with.
Experts in this business recommend “general” cleaning of the aquarium, depending on the type of fish, it can be once a week or 1-2 times a month. During this cleaning, the fish should be transferred to another aquarium and begin cleaning. It is necessary to drain the water, clean the walls and bottom of the aquarium from accumulated dirt, food residue and fish waste, wash the filter. You shouldn’t disturb the fish often, because they don’t like it, so too often cleaning the aquarium is as bad as forgetting about cleaning.
And so it turns out that the maintenance and care of aquarium fish is not so complicated as it seemed at first glance. You only need to adhere to the two rules in the process of caring for fish. The first thing you need to know is what conditions are considered optimal for keeping your particular species of fish, and sticking to them in an aquarium. The second in all aquarium did such as lighting, cleaning and feeding you need to adhere to common sense, that is, moderately to feed the fish, not very often disturb them cleaning, but also not to allow the aquarium to become like a swamp.

Vadim74

Well, probably because I have not bothered to find out in more detail and meticulously about their content in the aquarium! The reasons for this mass ranging from water quality and ending with epidemic diseases! In order to get a more competent and accurate answer in the direction, it is necessary to describe the clinic of fish death: what behavior, fins are stuck together, whether there is a rash on the body, mouth is open, what breathing is, eat or not before death, sometimes by the symptoms, you can predict the root cause of their death! And your question can only shrug or selectively call for one of hundreds of reasons)))))))

Natalia A.

Because the reasons are mass, ranging from improper start-up, overfeeding, crappy conditions, etc. ... Blow in the section to fortune-tellers, they will prompt you.
Svetlana Arkhipova gave you very sensible advice, she laughed for a long time! :))) The main thing is to clean the aquarium more often as she advised and your fish will live less, and also feed them with live food, especially predators and the result will surpass everything expectations;)))

Why do fish die in an aquarium?

Antonidas-san

The reasons:
1. Do not change the water
2. Do not feed or overfeed
3. The presence of air
To start, you need to change the water in the aquarium to clean, separated by 2-3 days to get rid of chlorine in the water. You can use special "additives" - they are added to the water from the tap, and settling is not required. The soil must first be boiled for 20 minutes, drain and cool. Plants, if there is a rinse in a solution of methylene blue according to the instructions, are always attached to it. This is all we are doing to get rid of the infection, if it is the cause of the death of the fish.
Pour cold ground, pour some water, plant plants. Add water.
In the round aquarium it is better to settle unpretentious fish, for example, guppies, swordtails, mollies or cockerels. For 1 cm of body length, 2 liters of water are required, that is, if 1 guppy fish is about 3 cm, then no more than 10 fish (and preferably 5-6) can be planted in an aquarium for 30 liters of water, otherwise they will not have enough oxygen dissolved in water. If this is a golden fish, then it needs about 15 liters per fishfish, do not forget that they are selling small, and they still need to grow.
Sometimes in the pet store there are infected fish - they are also alive, they experience stress (at least from a new place and water, and they are also caught and so on), and their stress resistance decreases from stress. It is very good to drop a couple of drops of methylene blue right into the jar in which the fish go home - she disinfects and soothes them.

Why die fish in an aquarium?

Yury Balashov

why fish die in an aquarium?
This is normal for young aquarists who are not familiar with the nuances of running an aquarium. Artem, you need to read and watch the training video.

Igor and

болезнь с белыми точками вряд ли вылечили, она косвенно говорит о том что в акв вообще могут присутствовать принесенные болезни…
т. е там где вы брали рыбу есть в наличии ихтиофтириос (бел. точки) , и логично предположить что еще болезни.
лечение довольно муторный процесс и никто не будет им заниматься серьезно в торговой точке за зарплату…
но это не значит что болезни у всех продавцов…
in your case, the fish fells some sort of 2nd disease, apparently from those that are not very well treated ...
or find out what it is and treat, if possible ...
or disinfect water and equipment. After destroying fish and plants, boil the soil ...
further retain new fish in quarantine water, it is much easier than treatment ...

Efa efa

This is the case when the miser pays twice. No wonder, I think, Aqua sold, got rid of it.
If you want to have a healthy, eye-pleasing aquarium, sell an existing one too. Or throw it away. Buy aquo firm "Jebo", there all the bells and whistles are already built. And do everything according to your mind, as it should be. I think it will be cheaper and calmer.

Natalia A.

What kind of nonsense about the bird market! I always took a fish there and I will take it, and if there is not enough brains to buy not from second-hand dealers, it is possible to penalize and adapt correctly here and the treatment will not help and the same will be done with fish bought in the store. Two-thirds of the fish in the stores are with the hated bird you are, only the rest are divorced and a tiny percentage of private owners. The author of the question, in your case, the details are needed, how was the bank, equipment, displacement, etc., started? Nuances and further, how did the fish adapt? And the firm of Jebo, by the way Chinese, however it does not matter, banks now have many manufacturers of the same quality, the only question is the price for the brand-solve problems, if you simply do not want to read literature ???

Irish @

By google: launching an aquarium. Pick fish under your liters, do not need overpopulation! Perhaps your aquarium needs an elementary cleaning, a siphon of the soil ... that's all. Fish can get sick from inappropriate content.

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