I have 5 Neon tetras and 2 Platys (was originally 5, but lost 3) also 4 Mollys, 1 male, 3 female, 1 Gold nugget pleco and 6 Corydoras catfish. The male molly is very aggressive at feeding time, he will chase any other fish away from the food except the Cory's (they fight back) Today I noticed that one of my tetras is missing part of it's tail fin. Could this have been my molly being a bully? If so, should I put him in another tank away from the others or leave him where he is???