Powder Brown Tang Sick!!?

[Salmon King]

I f it/s a fish only tank treat with coppersafe right away.I f it/s a reef tank there is not much to do.I would give the tang a freshwater bath.That will get rid of ich on the fish.You should quaratine a new fish for 3 weeks.I have been in the hobby 12 years and have paid the price for not doing it.Garlic is a whise tale.I talked to a marine bioligest years ago.He said it does nothing to stop ich.