06-18-2007, 05:35 PM
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well yeah its not like a set rule that they will definitely pick on a fish if they are by themselves. Some schooling fish will not feel safe if they are not in a school and will compensate by being more aggressive towards other fish. I rarely consider a bala an aggressive fish at all but some people have had aggressive balas when they only had one or two and they solved the problem by adding more balas. A more familiar version of this is with tiger barbs. Tigers are known fin nippers that will chase fish around a tank but in a larger school they will often leave other fish alone. They may chase eachother around but its not as aggressive and hostile. I have never heard that balas dont need a school as they get larger. I imagine that they would school as adults in the wild too. They are a relative of the minnow which we know definitely swims in large schools.