I have a pair of onyx clowns and when i bought them they were the same size. Now one of the clown is like 4 times the size of the other one. It been like a month now and it seem like they still dont like each other yet the big ones still beat the small one up. When they were first introduce into the tank the big one bit the fin on the side off on the small one. Now my small clown fish only have one fin but he seem to be swimming and eating ok just seem like he not growing. Any idea why this is so would be greatly appreciated. thanks