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How do you prevent diseases of the fish in our tank?

prevent diseases of the fish
Prevent diseases of the fish

Tanks are closed and limited ecosystems which makes them fragile to any external or internal environmental imbalance. In general, inside the aquarium, beneficial microorganisms tend to coexist with other harmful ones, which if the tank is not in optimal conditions, will affect the fish through the appearance of diseases. But what aspects should we control in our aquarium so that our fish are healthy? Here are some tips from :

The tank

The size of the aquarium is just as important to us as the size of our bed. Find suitable aquariums for the species you want to have. Remember, always go the largest size you can afford.

Clean water

We all like to have our house clean, right? Try to keep the water of the fish in perfect condition so that they can be comfortable and enjoy. In addition, the quality of the water will determine the good health of the fish.

Tank population

Avoid overpopulation of adult fish because they make cleaning more difficult to control. There is a standard ratio of number of fish to aquarium size which is 0.39 inches of adult fish per 0.264 gallons of net tank water, although this is quite approximate and varies by species. For example, in African cichlids from Lake Malawi and Tanganyika it is allowed to have a greater number of fish because this controlled overpopulation avoids greater aggressiveness of the specimens, but this will increase the water changes.

Tank water changes

It is recommended to change between 30% and 50% of the water once a week in tanks with many fish and little vegetation and if we have many plants that consume the waste generated by the fish it can be reduced to 10% -15% at week.

Air pump and filter

Fish breathe oxygen from the water, so it is essential that they have everything they need. Find out what your fish needs and install the necessary pump. Depending on the species and size, you may also need a filter to purify and oxygenate the water. Clean these filters with some frequency –when you see that they lose water flow-, but always with water from the tank itself in an external bucket. If you clean it with tap water, you will kill the bacterial colony that does the filtration work.


Are they cold water or warm water fish? Be clear about it and keep them at the right temperature.


do not let them be always in the dark, fish also need to receive light and it will be your job to provide it. If you are going to have plants this point is also very relevant.


Feed your fish but don’t overfeed them either. Find the best diet for them and follow the recommendations in terms of quantities. The diet should be varied, alternate scales, with frozen, with porridge and with live food, that will give health to your fish. Always find out well about the nutritional needs of the animals that you have in your tank.

prevent diseases of the fish
A well-cared aquarium, allways looks healthy

Choice of fish

Tanks according to species can be: community where all kinds of fish coexist, geographic where fish from a specific area of the world coexist and are stricter in their conditions, or single-species aquariums that are usually linked to fish farming. In any case, even if it is a community, try to ensure that the species you have have water parameters -ph and gh- and similar temperatures in nature. Combining incompatible species results in the end in poor condition of some species and therefore in the appearance of diseases. It is necessary to read good publications and books on the hobby to know all this.

If you follow these tips you will greatly reduce the possibility of the appearance of diseases, but even so, if any disease appears, do not hesitate to have

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