04-15-2012, 01:03 PM
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No one can seriously argue the scientific evidence, which is that shoaling fish maintained in too small a group will usually show increased aggression. Nor can anyone argue that the Tiger Barb as a species is naturally more nippy/aggressive by nature. Whether or not these traits are heightened or lessened can be due to a number of factors such as water parameters, tank size, number in the group, tankmates, foods, tank decor, light...whatever. But we do know the "normal" behaviours, and planning for those is always the best and wisest course of action.
Nature made fish the way they are, through evolution of each species relevant to its habitat, and none of us is going to change this no matter what we may think or try.