Not my fish, trying to advise someone on a FB group... I've never seen black ich in person so I'm not confident in diagnosing it... What do you think?
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As per OP, not my fish... I thought black ich and velvet possibly?Sorry this happened to your fish. Check out this thread https://www.reef2reef.com/threads/black-ich-turbellarians.259912/
Looks like it be a combination of things. How long have you had this fish? Have you added anything new to the tank recently? Is he eating or behaving strangely? How long has it been since you noticed the symptoms?