What do i do with a fish bully? The bully is a zebra danio. He chases all the fish that are in the tank with him, all the fishes tails are all biten up, he even bullys around my baby angel fish and my male fancy guppy that i got yesterday. Here is what i have in the tank so far, 1 male fancy guppy, 2 baby angelfish, 1 female guppy, and 1 zebra danio. Should i put him in a 5 gallon tank for now? Or should i go to the pet store and sell him or what?