what size tank is the fish in ?? what is its diet (specifically) ?? i have cured fish so bad that you couldnt even telll that they were a Sohol and Chevron tangs. proper diet (soaked in a garlic extract), low stress, and excellent parameters seem to have been the cure for them, IME.
i hate to sound like a tang cop, but the stress of a smaller tank seems to be a serious contributor to this disease. here is an article by Steven Pro that really helped me ...
sorry same article that SAT provided.
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