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Why do goldfish die in an aquarium?

maintenance, care, compatibility

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!

HERE’S OWN, WHAT HAS BEEN AWARDED ME WRITE THIS ARTICLE!
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?

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

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.

Question “Snowy turtles.” – 3 answers

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.


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


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.

Why do fish in aquarium suddenly start dying?

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.

The death of pets is always a sad event for the owners, even for those who contain only fish. Especially when they start dying one after another.

Let’s try to figure out why the fish die in the aquarium.

The first and most common reason that fish die one by one is water quality. Perhaps it has not changed for a long time, and harmful microorganisms have developed there, or, conversely, before the change the water did not settle well or had a temperature much higher or lower than necessary.

To eliminate this cause you should immediately change the water in the aquarium.

Feed quality may also affect the fact that the fish began to breathe. Food may be expired or unsuitable for the type of fish you are keeping.

Another factor important for fish is lighting conditions. They should be optimal and as uniform as possible.

Fish can begin to breathe even in a new aquarium. The reason may be that the stores often wash aquariums, to give them a more presentable appearance. And it is not known which ones detergents used for this.

Therefore, if the fish began to die in the new aquarium, they should be immediately removed to another tank, and the aquarium should be thoroughly cleaned.

The reason why fish aquarium die can be disease, listed in the aquarium. And she can get there in different ways. For example, with insufficiently purified water, but more often it penetrates with another, already infected fish.

This can happen if you recently purchased and put a new pet in the aquarium. Particularly increases the risk if you want to keep ornamental fish and fry caught in local water bodies in one tank.

To avoid contamination of fish from a new one, you need to put each fish you just bought before going to the aquarium in quarantine, a separate container for several days.

Causes of Poecilia reticulata death: water pollution

Acclimatization and improper compatibility as a result of the death of fish

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 types of “entertainment”, but they are accustomed to this way of life.

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.

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