Ich
Treating just the one fish will do nothing for you. If you read the article closely, you have to leave the main tank fishless for at least 4 weeks to make sure that the parasite can't complete it's life cycle. Then the main tank will be ich free. Treat all of the fish with hypo salinity to be sure that even the fish showing no outward symptoms aren't hosting the parasite. Once both the fish and the tank are Ich free ( 4 - 6 weeks) then you can recombine the two.
What kind of tang do you have? How much distress does it appear to be in?
Garrick.
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