Hello I’m new to reefing and would appreciate any help I can get. This morning when I checked on my fish I noticed my blue tang had black spots on the front half of the fish both sides it does not look good. The Blue tang is swimming normal and eating good. It is a fairly new tank and I only feed them once a day right now. I have 2 clownfish 1 inch big and a Blue tang around 1 inch and a 1/2. Clownfish look normal and eat good. The only thing I’ve noticed before this is that the Blue tang seems to have a whiteish belly or a lighter skin. I am feeding Hikari marine s sinking food one day and Hikari mysis shrimp (frozen) the next day. Also I put a piece of red marine algae in the tank for the blue tang. I’m just worried and would appreciate any advice Please and Thank You.