I bought a Powder Blue Tang and noticed Ich the other day. I did know this fish was prone to ich but wanted to try something more challenging. I have had a reef set up for 2 years now with no major problems. The tank is a 150 with a 110 gal sump. There is plenty of live rock and I am about to add another 50lbs. Once in the very beginning I did have Ich on a few fish and gave them crushed garlic mixed with a blend of frozen food for 6 weeks. It went away. I also have 2 cleaner shrimp 2 skunk shrimp, which I see most of the fish going to on a regular basis. I do not have a QT for the simple reason that I just don’t have the room. Something I am planning in the future. Also have a UV, which comes on for 6 hours a day. I did an 8 minute freshwater dip on the PBT and didn’t see any difference. He is very active and eating any and everything I offer. My question is what exactly does the freshwater dip do? Should I try it with copper added? Any other suggestions, which have worked?