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Die fish in an aquarium what to do

maintenance, care, compatibility

Suddenly discovered that you have died in a fish tank and do not know what to do now? We have compiled five tips for you to cope with the death of the fish and what to do if this happened.

But, remember that even in the most ideal conditions, they still die. Often, suddenly, for no apparent reason and very annoying for the owner.

Especially if it is a large and beautiful fish, such as cichlids.

Attention! First of all, check how your fish breathe!

Often aquarium fish die due to the fact that the water parameters have changed. The most pernicious effect on them is the low level of oxygen content in the water.

Characteristic behavior is that most fish stand in the surface of the water and swallow air from it. If the situation is not corrected, then after a while they begin to die. At the same time, such situations can occur even among experienced aquarists!

The oxygen content in water depends on the temperature of the water (the higher it is, the less oxygen is dissolved), the chemical composition of the water, the bacterial film on the surface of the water, the outbreak of algae or ciliates. You can help partial water changes by turning on aeration or directing the flow from the filter close to the surface of the water.

The fact is that during gas exchange, it is the fluctuations of the water surface that play the decisive role.

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 …

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. To solve the problem will help water renewal, intensive aeration.

Fluctuations of the surface layer of water play a leading role in the gas exchange of a closed space.

  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.

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.

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.

  • 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 food well? Are there fish that refuse food? Is it possible bloating in one of the fish? 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.

  • 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.
  • 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.

    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.

    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.

  • 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.
  • Sometimes in the aquarium, the fish begin to die one by one. Their owner makes a rash decision – he goes to the pet store and buys any funds offered by the seller. But nothing helps.

    So, why fish die in an aquarium? There are several reasons for this.

    The main problem of all troubles in an aquarium is dirty water. Beginning breeders, as a rule, forget that the fish not only breathes and eats, but also feces.

    As a result, the increased content of nitrate, ammonium and nitrite leads to a mora. And the first two are especially dangerous.

    Poisoning with these substances can be seen with the naked eye: a smell of rot appears, the water becomes cloudy and the question: “Why do fish die in an aquarium?” Can be considered closed.


    Bacteria that fight poison and toxins live in the filter media and in the soil. It is important to clean both substrates carefully but carefully.

    Otherwise, you can destroy the fighters for health. Thus, there is no need to clean the aquarium to sterility and periodically turn off the filter (otherwise anaerobic microorganisms will settle there).

    By following these simple rules, you can maintain the health of this biosystem and then the fish will not die.
    To restore the lost balance, the following instructions are recommended:

    1. Stop feeding for a short period of time. Fish without food can last for several days
    2. Measure the level of toxic substances using special tests (sold at the pet store)
    3. If the readings are equal to 2 ppm, then it is necessary to replace half the water in the aquarium, but gradually, otherwise the death of the fish will not stop.
    4. Follow the second and third points for several days until the microflora is restored.
    5. In no case can not use antibiotics. They are completely destroyed biobalance!

    It is important to remember that the aquarium, as a fabulous teremok, can fall apart if it is overpopulated. Fish die because of gluttony. If overfeeding occurs, food debris will simply begin to decompose.

    Therefore, it is better to reduce portions than to increase.

    Very often, this is the reason newcomers hear from sellers to the question: “Why do I have fish die in an aquarium?” Because the latter are interested in profits from selling expensive medicines. It is important after the purchase of pets to quarantine, and sometimes – preventive treatment.

    But even in this case, the fish can get sick. In this case, to prevent the pestilence, the ill person should be placed in a separate aquarium.
    Imported fish sometimes bring rare species of disease that cannot be determined without special laboratory analysis. In pet stores there are a lot of drugs that can save pets from misfortune, but it’s better not to be consulted about the choice of treatment from the sellers, but from experienced aquarists.

    But, as a rule, before treating the problem itself, it is necessary to look for its source: reduced immunity and, consequently, the poor state of the composition of the water.
    Fish die from many causes, but the pillars of care for them are unchanged: regular cleaning of the soil and water filtration, timely replacement of water, not overfeeding.

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