Some of the semi aggressive fish can go well with some community fishes. Red tailed shark is one of the examples of this kind. But some semi aggressive fishes are really troublesome to other some small and less active fishes. Blue acara, Black acara, Fire eel are some of the examples of this kind. You can make use of aquarium heaters and filters in your tank. Even fishes may suffer of some sort of diseases like bacterial diseases, fungus diseases and scrounging infections. Since most of these kinds of diseases are due to unclean water, it is necessary to use purifiers in water tank and also recommended to change the tank water at least once in a month.


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