Most of the time, when I see a spot or two on a fish, I wait a while and just make sure to provide a good diet for the fish. For me, this has always succeeded in ridding the fish of what ails it, but I've never had a big outbreak. In your case, how did this come about, and how certain are you that it's ich? I see some people make kneejerk reactions to one or two little spots, and usually that's more detrimental than the problem would otherwise be.