I just purchased a Lawnmower Blenny that always seems hungry. He nips at the live rock. I do have a little green fuzzies on the glass but he keeps that pretty clean. I have put a small piece of algae sheet in the tank and it seems to disappear overnight. There is 2 percula clowns to keep him company and I know they don't eat the algae sheets. Any suggestions? Or is he fine?