Hello, I have 5 harlequin rasboras, 1 male guppy, and one dwarf gourami in a 10 gallon with lots of plants and hiding spots. My problem is that one of my rasboras (actually the smallest of them all) is an agressive little jerk to the rest of the fish. He leaves the dwarf gourami alone but for all his other rasboras and the guppy he chases and nips them. It makes the tank look hectic and he breaks up the school. Iwas wondering what to do about this? I may try and take this fish back to the pet store and get another.