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Do you have any tank mates in there? It looks like a bruise. It also looks like it's fins are a little battered so that could indicate a bacterial infection. Recommend treating with kanaplex and furan-2
The image isn't super clear so someone correct me if I'm wrong
You don't need him to eat kanaplex you can dose straight into the water.the only other tank mates is a wrasse. There was a blue tang but I took him out over a week ago. He eats like a pig but I can’t get him to eat kanaplex