If this happens to me, I would start soaking food in garlic and feed him. Some other ppl will advise you to take the fish out and treat him with copper but i think this will add more stress on him. Your water already have ick so likely your clowns and gobies will get it too but they may not if their immune system are good. Ick does not kill the fish fast so you got time to treat and observe him.
Make sure it is not velvet. If it is then you need to take all fishes out and treat it with copper right away. Good luck
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