I suppose there is more than one way to skin a cat as they say..
For as along as I've been in the hobby I have never used meds or hypo to battle ich. The first time I was ever exposed to ich years ago someone said to try cleaner shrimp, so I did and it worked beautifully. Ever since then I have always had an army of cleaner shrimp (presently 4 skunk cleaners and 2 fire shrimp [yes they clean too!]). I have 3 tangs presently and each of them (and sometimes one or two other fish) get ich as soon as they were put into the tank but a few days of cleaner shrimp loving and they are clean as a whistle. When they are not cleaning they readily eat anything I put in the tank, but they seem to enjoy cleaning a lot, even when I don't see signs of ich on any fish. Anyway, that's been my experience. Sorry to hear about your battle
