My clown that I have had since I started the tank (about 3 months) has not eaten in the last 2 days. I tried flake, pellet and frozen mysis but he won’t eat any of it. I also noticed a spot on him today. Only one that I can see and am hoping it is not ich. Would this cause him to stop eating? Tank mates are a cleaner shrimp, firefish and diamond goby.