Good luck. Your fish hardly has ich. I am sorry, but I do not agree with all the experts above. Ich management is the way to go. You are risking killing your fish. How long do you want to do the copper, four months? Better watch the copper close, it often kills when the levels go off. I get a spot of ich every once in awhile and feed to build up immunity, change water, do the things you should. My current oldest fish is 11 and the rest are about 7 years old and still going strong. I am also not a newbie. Over 40 years taking care of fresh and marine fish. Marine fish can hold up better to ich than even fresh water fish. Get a spot here and there, get over it, that is most marine fish. This copper or else thing, I am on the fence. A lot of marine keepers do ich maintenance. BRS had a video on this. In the forums, this is often the start of a battle as everyone has their wise words. I feel sorry for this fish. Are you prepared to pull it out of the tank every time it gets this? Fallowing a tank is not a guarantee. Ich can come on live rock, snails, crabs, and corals.