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I've had it happen to my yellow coris wrasse, I freaked but he got better in time. You prob. Have a bully in your tank, a little dwarf lion fish did it to my coris somehow???
He'll be ok
Only other fish to give him competition was my clarkii but they got along. Left for 15 mins came bak an he was died. I google it and the only that came up with that symptom was tuberculosis