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Why do fish die in the aquarium at home?

maintenance, care, compatibility

Check and recalculate your fish daily, while feeding. Are they all alive? Are everyone healthy?

Does everyone have a good appetite? Six neons and three speckled, everything is in place?
If someone is missed, check the corners of the aquarium and lift the lid, maybe it is somewhere upstairs in the plants? But you can not find a fish, it is quite possible that she died.

In this case, stop searching. As a rule, a dead fish becomes visible anyway, it either floats to the surface, or lies on the bottom, the floor is snagged, stoned, or even falls into the filter.

Every day, inspect the aquarium, did the dead fish appear? If found, then …

Why die fish in an aquarium and what to do.


The motive for writing this article was the communication on the form Fanfishka.ru with a certain citizen who wrote in the section on helping to determine the disease of fish.

“Please help me with a telescope at the age of 6 months. I have not eaten anything for three days. Swims on the surface with difficulty, enough air.

External damage and tumors are not observed. Help if you can still, it’s a pity to lose a fish. ”

Being a conscientious and sensitive person, I gave her a plan of action and events according to the full scheme, advised the preparations. And then, when I wrote everything, I thought – why should I treat it so radically, maybe the reason for the poor health of the fish lies on the surface? 🙂

In this connection, I asked a citizen: “Tell me, what is the volume of your aquarium, who lives there besides the telescope, etc.”.

When I got the answer, I just went nuts! I am trying to get along with treatment and help, but it turns out that … read the answer: “Aquarium 80 l. 1 gourami, 2 thorns, 2 gold, 2 telescopes (1 patient, another healthy, but for some reason it does not grow), 2 zebrafish, 2 small antsistrus, 2 speckled catfish, 1 scalar, 2 ampouleries … ”.

The reason that the telescope was bad – was disclosed.

Imagine if 16 people planted in an eight-meter hut, how much would they stretch. Whatever the conditions in this hut, the sea would start in a month.

Vendors of pet stores are putting fish to beginner aquarists using their insatiable, desirable “I want this fish, this one and that one and those catfish”. At the same time, neither of them think about the further fate of the fish.

Sad! But for some reason, this is exactly the fate of “cramming in untill” that only aquarium inhabitants comprehend.

Imagine, mother and daughter come to the pet store and say: “Give us 15 cats, 3 Yorkshire terriers, 5 chinchillas and one sheep-dog and 2 more parrots do not forget.” Unfortunately, with aquarium fish this is exactly what happens.

And then, after a while, a convulsive scripture begins and the search for an answer to the questions: why the fish die and die, why do the fish lie at the bottom, float or swim on the surface, do not grow and do not eat!

This is some kind of attempt to stop the mockery of fish! An article for future similar questions.

An article that will somehow help newcomers and people who are going to buy an aquarium to understand that the fish are the same living things as we do – they grow, require certain conditions of detention, have their own characteristics, etc.

Very clearly, this problem is visible in Goldfish (pearls, comets, telescopes, veils, shubunkin, oranda, ranch, koi carps, etc.). People either do not know or do not understand that this family of fish belongs to large species.

In fact, they need to be kept in ponds (as it was in Dr. China) or in large aquariums.

But it was not there! People for some reason have developed a Hollywood stereotype that Goldfish looks beautiful in a round small aquarium.

HOWEVER, THIS IS NOT THE CASE. The minimum volume of an aquarium for a pair of goldfish should be from 100 liters.

This is the minimum in which they can live normally, and it’s not a fact that they will grow “to their full height”.

Therefore, recalling the above example of a citizen who has an 80-liter aquarium in which: 4th scrofula, scalar, gourami and others … it is not surprising to hear “My golden fish does not eat anything, lies at the bottom or swims the belly to the top.” And it touches the question, why do they not grow?))) But how can you grow here, you wouldn’t die!

In addition, in this example, there is a relative compatibility of fish. We must not forget that Scalaria is a peaceful, but still South American cichlid, and somehow it’s not a friend with goldfish.

The same goes for the gourami – they are peaceful, but snooty individuals come across.

Summarizing what has been said, I earnestly ask everyone not to violate the norms and conditions of keeping the fish.
Do not be greedy!
And then your fish will grow beautiful and big.

Somewhere I read that for 1 cm. The body of a fish without a tail should have 2-3 liters of water in an aquarium. Who cares here is a link to the compilation – How much can the fish in an aquarium X liters (at the end of the article, select the aquarium of the desired volume).

Now I would like to talk about other reasons that lead to poor health of fish, without any visible reason (signs of the disease are not visually visible).

If the norms of the volume of the aquarium are not violated, the compatibility of the fish and their number are not violated, and the fish still float or vice versa lie at the bottom and swallow air, then the reason may be:

Poisoning fish with nitrogen, ammonia,
and more simply poop

We live in the air, and the fish in the water. Parameters of aquarium water directly affect the health of the fish.

In the process of life, aquarium fish and other inhabitants defecate, another organic matter dies, the remains of food decompose, which leads to excessive saturation of water with nitrogenous compounds that are detrimental to all living things.

Thus, the cause of poor health or a pestilence in fish may be:

– lack of care for the aquarium (cleaning, cleaning, siphon, no filter or replacement of aquarium water).

– overfeeding fish (the presence in the aquarium is not eaten feed).

– late utilization of dead fish and others (some newbies watch snails burst dead fish, this is absolutely impossible).

What to do in this case? It is necessary to eliminate the sources of nitrogen excretion:

– urgently transplant fish into another aquarium with clean water;

– enhance aeration and filtration;

– clean the aquarium, and then replace it? aquarium water to fresh;

– fill in the filter aquarium coal;

It should always be remembered that Aquarium water needs to be replaced weekly. However, this is not always good – old water is better than fresh, especially for young aquariums, in which the biobalance is not yet tuned.

So this should also be done with the mind and as needed. If you see that the water in your “young aquarium” is not green, not muddy, etc.

Replace at the beginning of 1 / 5-1 / 10 of the volume of aquarium water. However, one should always keep in mind that clear water is not an indicator of its purity.

With that said, it is necessary to develop your own “tactics” of water changes based on the volume of the aquarium, its age and the preferences of the fish, etc.

Emergency fish transplant – This is a temporary measure, if the fish is very profitable. As a rule, when a fish is not feeling well (lying on the bottom, swallowing air, swimming on its side, etc.), such an action brings it to life and after 2-3 hours it is cheerful and cheerful.

It should be remembered that such a transplant should be done in the water at about the same temperature as in the aquarium, the water should be separated (preferably), do not forget to provide aeration. And yet, if there is no other aquarium, an emergency temporary transfer can be carried out in a basin or other vessel.

About coal. Aquarium coal is sold in any pet store.

It is not very expensive, so I recommend to buy it in reserve. Coal is a great additional measure in the fight against “poop and other evil spirits.”

If it is not at hand, you can temporarily take human activated carbon, wrap it in gauze or bandage and put it in the filter.

There are also so-called ion-exchange resins, for example, zeolite, they also refer to absorbents as coal, but they work, if you can say so at a more subtle level — removing nitrites and nitrates from the aquarium — decomposition products of ammonia, which in turn is formed from dead organics and waste products of hydrobionts.

Water filtration. Everything is simple.

The aquarium filter must be suitable for the volume of aquarium water. Additional helpers: aquarium plants, as well as snails, shrimps and crustaceans.

In the end, we can advise the drug for quick cleaning of the aquarium from sewage – TetraAqua Biocoryn.

Another reason that the fish die can be the wrong adaptation of newly purchased fish.

Well, firstly, you should not release new fish immediately into the aquarium. Everyone knows that.

Let them acclimatize: Therefore, see the article All about Purchasing Transplant Fish Shipping!

Secondly, the fish that lived in the pet store or grew up in another pond got used to certain water parameters (pH, hD, temperature) and if you transplant them into water with radically opposite parameters, this can lead to their death in a day or a week.

Actually therefore for the correct adaptation there are so-called quarantine aquariums. You kill two birds with one stone: check whether new fish are contagious and adapt them to new conditions.

The quarantine principle is simple – it is a small aquarium (another reservoir) into which new aquarium inhabitants are launched and within a week they are checked for lice, as well as they gradually add aquarium water from the aquarium in which they will live.

You can do without quarantine, but it is a risk! As a rule, it carries in 80% of cases, but 20% still remain.

To neutralize these 20% I recommend to transfer fish with the drug company Tetra AquaSave (Tetra AquaSafe), read here DRUGS AND TETRA AIR CONDITIONERS. This preparation “improves” aquarium water and reduces the stress of fish during transplantation.

The third reason that the fish is bad is asphyxia, caused by the lack of sufficient aeration of aquarium water.

The obvious signs of asphyxiation (suffocation) in fish are: frequent opening of the mouth, heavy breathing, wide opening of the mouth – as if yawning, the fish swims near the surface and there is enough oxygen.

You should know that the fish breathe oxygen dissolved in aquarium water, which they pass through the gills with water and if it is not enough of the fish simply suffocate.

Enhanced aeration and bringing it back to normal will correct the situation!

Another – the fourth reason for the ascent of the fish with a belly to the top can be the use of tap water

Opinions on this are different. While talking and debating on this topic, some comrades say: “Yes, all this is fihgnya, I fill in unperturbed tap water in the aquarium and everything is fine – the fish will not die”.

However, it is worth noting that tap water in many regions of the CIS is simply terrible! It contains so much bleach and other impurities that it is scary to use it.

Somewhere, of course, the water is better here and “carries” – the fish do not die. In the Czech Republic, for example, tap water is generally spring water from the Karlovy Vary sources, but alas, where is the Czech Republic, and where are we ?!

Therefore it is very important to use only separated water for the aquarium. In addition to the fact that chlorine will evaporate from the water and heavy impurities will settle, excess oxygen will also be released, which are no less destructive for fish.

What to do if you poured tap water and fish from this poplohelo? Ideally transplanted into separated water.

However, if you originally poured water, then you probably do not have separated water. One way out is to add aquarium chemistry that stabilizes the aquarium water.

For example, the aforementioned Tetra AquaSafe or TetraAqua CrystalWater.

The fifth reason for the death of fish – a violation of the temperature

The generally accepted temperature measure of aquarium water for many fish is 25 degrees Celsius. But too cold water or too warm leads to all the same symptoms: the ascent of the fish, lying on the bottom, etc.

With cold water, everything is clear – you need to buy a thermostat and bring the reduced temperature to the desired one. But with too warm water is much more complicated.

Usually aquarists encounter this problem in the summer, when the water in the aquarium boils and rolls over 30 degrees, from which the fish become lethargic and “faint”.

There are three ways out of this situation:

– to cool the aquarium water handicraft: using frozen 2n. bottles from the fridge. But – this is not very convenient, because frozen water quickly gives off cold and you need to constantly change the bottle.

In addition, jumps and temperature fluctuations – there, no less harmful than just elevated water temperature.

– Special aquarium cooling installations are sold, but alas, they are expensive.

– buy an air conditioner and install it in a room with an aquarium, in addition to room stuffiness, the air conditioner will also beat down the aquarium heat. The last option in my opinion the most acceptable.

The sixth and seventh reason

Sometimes the cause of bloating the fish and swimming a belly or side to the top is overfeeding. Again, this reason is largely related to goldfish, because they suffer from gluttony, overeating and begging.

Do not enter them on occasion. Feed them exactly as much as it should be.

Otherwise, your gluttons will earn inflammation of the gastrointestinal tract or, more simply, they will suffer from constipation!

Another reason for which the fish can lie down for no apparent reason is stress. Well, do not like her neighbors and that’s it.

Or it often happens that they take young fish, and all the boys and one female grow out of it, and as a result “the boys start a showdown” – who is in charge. The weak begin to chase and tyrannize, with the result that they are hammered into a corner, lie on the bottom, well, and die.

There is only one way out, to resettle everyone, give them to friends or back to the pet shop.

What else can affect the health of fish:

– excess lighting or stress from it;

– decorating an aquarium with chemically dangerous decorations (metal, rubber, plastic);

Summing up, it is possible to make an unequivocal conclusion that the correct maintenance of fish is a panacea for many aquarium ills. If you are attentive to your aquarium dwellers, they will thank you too.
beauty and longevity!

We also recommend that you read the brochure Navigator 3: an interview with an ichthyopathologist. Below is a link to the pdf-version, which you can download, as well as its test version.

To read and / or download “Navigator”

click on the picture below

If you do not have a PDF reader installed, we recommend that you use AdobeReader by downloading it from the official site.

Useful video about the treatment of fish, which will help solve the question of what to do with a dying fish?

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 do fish die 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, to detect and classify which are sometimes not possible on their own.

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


Aquarium fish … What kinds of them just do not happen – big and small, peaceful and not very, schooling and lonely: everyone can find for himself what he needs.

Most of them do not need special care, so they have become quite common favorites, but despite this, before getting these beauties, you should know some rules, without which they just die in the very first hours of their stay in your house.

Fishes necessarily need air — more precisely, water aeration; without oxygen, they, like any living thing, will perish. Before running the fish in the aquarium, you need to make sure that it is clean, not leaking, and the materials used in it do not emit harmful substances.

It is advisable to pour boiling water over the aquarium; The same must be done with everything that will be inside – sand, stones, scenery – and be sure to defend the water for at least 24 hours.

So, everything you need is respected. But after a few days, and maybe immediately the fish began to die. What is the reason – why die aquarium fish?

Let’s see! The first reason is the wrong adaptation of the fish.

After the purchase it is impossible to simply release it into the aquarium, this can lead to an animal to shock and, as a result, to death.

The second reason may be the lack of oxygen: it is often found if the aquarium is small and there are many fish or they are large – therefore, keep proportions! The third reason may be a disease – it could be either before the purchase, or it could start after, due to a change in the “climate” situation, due to a decrease in immunity. The fourth reason can be poisoning, most often – nitrogen compounds, that is, the decay products of the life of the fish, so the cleanliness of the aquarium should be given special attention.

The fifth reason is tap water. Perhaps the human body is not particularly sensitive to the hardness of the water and the content of chlorine in it, but for fish it can be deadly!

The sixth reason can and not be noticed, and why aquarium fish die, immediately fail to understand: it does not always appear immediately. We are talking about the aggression of neighboring fish, and to prevent it you need to know the compatible types of fish.

Here are the main reasons most often found in newbies. There are, of course, such as overfeeding, insufficient sanctification, but they, as a rule, are rarely found.

Watch the state of the aquarium, water and fish, and your fish will bring you not only joy, but, perhaps, addition. Good luck!

Is it necessary to change the water if one of the fish died :: how to change the water in the aquarium :: Aquarium fish

Tip 1: Do I need to change the water if one of the fish died

Often, inexperienced aquarium owners rush to replace all the water in a tank if one fish dies, as they fear the contamination of the aquarium. So is it really necessary to completely change the aquarium water, or are there other rules for dealing with an aquarium in which one of its inhabitants died?

The question “opened a pet store. Business is not going. What to do? “- 2 answers

If only one fish dies in the aquarium and the water looks clean, it is not necessary to change it, because after changing the water, it will be necessary to wait for the restoration of the ecosystem and biological balance. Therefore, it is enough just to add fresh water, renewing the old one.

If the fish has died from an infectious disease or has lain in the aquarium for several days, the water should be replaced, while washing out the aquarium.
When adding fresh water to the aquarium, at least one third of the old water should remain – at the same time, fresh water should have similar hardness and temperature indicators.
If you still need to clean the aquarium, you need to remove all live fish and plants from it, wash, disinfect and dry. After that, new water is poured into the tank. In the first few days a short-term bacterial outbreak with water clouding can be observed in the aquarium – no need to worry, it will pass by itself.

After that, as the water becomes transparent again, plants can be returned to the aquarium, and it is advisable to launch the fish in about a week. Replacing water is often the most effective way to get rid of bacteria, but for fish it is a lot of stress, so you should not abuse it.

An electric or vacuum pump is great for changing the water in an aquarium. A siphon will also do well with this task, with the help of which the walls and bottom of the aquarium are easily cleaned of food and residue residue. To prevent the water from turning green, the aquarium should be placed away from sunlight and turned off artificial light at night.

In addition, it is necessary to periodically remove excess plants from it and feed the fish less so that the water is not contaminated by the remnants of food.
Somiki-antsitrus, which slide along the aquarium walls and eat plaque on them, will also help to clear the water.
Partial change of water in the aquarium should be done every week, changing it to 1/5 of fresh water. In order for the water to always be clear and transparent, you should launch mollusks and daphnids into the aquarium. Many owners of aquariums are trying to clean glass containers with snails, but they are not very effective in doing this and besides they are spoiling quite a lot.

Water problems are usually characteristic of “young” aquariums – later their own ecosystem arises in them, the situation normalizes independently. The main thing – to follow the rules for the care of the aquarium.

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