wontonflip
I failed Kobayashi Maru
My yellow tang had what I think was black ich; he died (but he was also a new fish, and wasn't well anyway).
Either way, my advise stands -- either leave him be and hope for the best, or treat him (and all the fish in the tank) with copper or hyposalinity AND leave the tank fallow for a few weeks to truly get rid of it. If he does have ich, and he's super sensitive, it will not stop reoccurring until you kill off the parasites. If he survives it, then he'll be stronger for it.
Either way, my advise stands -- either leave him be and hope for the best, or treat him (and all the fish in the tank) with copper or hyposalinity AND leave the tank fallow for a few weeks to truly get rid of it. If he does have ich, and he's super sensitive, it will not stop reoccurring until you kill off the parasites. If he survives it, then he'll be stronger for it.