One of my bala sharks (~6 inches) got himself stuck in a hole in a piece of driftwood and tore himself up pretty good, no missing fins but a lot of missing scales and a couple little spots that I can see blood. He's still swimming fine, didn't want to eat tonight but I'm not really surprised about that and he's sort of hiding in the back of the tank. I've added Melafix to the water anything else I should do? I was considering adding salt, but I'm not sure it's necessary.