Another thing, your profile says you have a 65g tank, which is too small for the yellow tang, and especially the clown. Clown tangs are massive and belligerent tangs and should ideally be in over 300g of tank. It may be small now but it's aggressive behavior is already obvious, and this will only get worse as it grows. You should consider removing the clown tang if you don't want all your other fish to be in danger.