I have a white cheek tang and it pops up with ich every now and then. I run a UV and it helps somewhat but what i found to help allot was adding garlic dosing to my tank. I have a 90g and i dose about every 3 days and it keeps it at bay. I tried No Ich and it didn't do nothing. I spent $60 bucks on it and my ich got worse. I dose garlic and it all went away. When my nitrates get high it usually comes back but i up the dosage of garlic and it helps and do a waterchange.