Cleaner shrimp do well in small groups, they'll breed and provide planktonic food for fish and corals. A lot of people say garlic doesn't work, there is evidence to support this if you look around. I've had reasonable luck with garlic, the idea makes sense to me, feed the fish garlic, the garlic comes out in their waste, (salt water fish don't pee they osmoregulate), the garlic isn't nice for the parasite so it drops off. I learned the hard way about QTing fish and I strongly recommend a QT tank, even if it's just for a week or so to observe your fish. The ich may have manifested itself simply from the stress of a tank change, Tangs are notorious for it. I would QT any tang before putting it in my display tank, other fish (hardy) I've put in with out problems but really, I should QT.
Douglas
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