I was looking at my RBPs tonight and noticed that one was missing a bit of skin at the back of his underbelly. I can see some of his intestine that's made it's way through the hole and I don't know what to do! I put in some Stress Coat which claims to help but I know that the others are going to bully him and I don't know how to help! I know that piranhas do this but he's my favorite and I really don't want to lose him! He seems to be swimming ok, but slightly favoring the injured side. What should I do?