What if the aeration stops? There are numerous reasons why this happens, one of them being the failure of the pump. Others may be while we are moving the fish to another tank. For whatever reasons, we should keep an eye for trouble. Fish accustomed to aeration will suffer in still water.
It is better to regard aeration as an auxiliary or a reserve, something that can be turned to for help in case of emergency, such as the sudden arrival of extra fish. Therefore if we have a tank with a small air surface, keep only a few fish. If we have more fish, then get a larger tank.
Putting more fish in an aquarium with small air surface and providing an aeration to them is not a good action. It takes only one fish to catch a disease for all in that cramped aquarium to succumb to it. The cure is to have a larger aquarium, with larger air surface. Providing aeration to overcrowded aquarium is not the answer.
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