Hey all, so I’ve had this yellow tang in my tank since September 25,2021 he’s been doing great eats both the frozen food and algae I put in the tank. I recently introduced a fire fish and sand sifting goby late December who are also eating well. Today I noticed these marks on my tang, none of my other fish have it including my new fish it seems to protrude a bit which I tried to show in the photo, is this ick? What should I do for treatment if necessary? I’m also aware it has hlle, which he had when I bought it, is there anyway to help reduce or treat this?