how many siamese fighting fish in one tankThese are good group fish as long as the option of tankmates is made with care. During and after nest building, the male is extraordinarily aggressive and will regard the rest that even remotely resembles a fish as a rival. This is very true if it is analogous shopping fish even a female, or a colourful fish. For this reason which you can only keep one male per tank and also you must select its partners carefully. They do fine in a group tank with fish that are very peaceful, identical in size, and more drab in color. Females can be kept in groups but males might be kept singly.