i have 15 rbp all ranging from 1.25 inches to 2 inches in a 75 grow out tank. i have good filtration and driftwood for hidding spots. they will be moved in a 350 gallon pond when they reach around 4 inches. anyways the problem is, one of my two inchers is bullying everyone and another one of my two inchers has a chunk off of his head near the fin. i keep them well fed the whole day. they cant even finish the food i give them sometimes (shrimp and tilapia). what should i do? should i get rid of the bully two incher or should i just leave him in there? i understand piranhas heal fairly fast.