| I'm with Greg, not a fan of using chemicals. Salt and heat treatment is usually the best way to go, unless you have salt sensitive fish-plecos, catfish, loaches, tetras, any scaleless fish...but then they'll also be sensitive to the ich meds available. Also, keep in mind, those meds claim they treat ich in 3-5 days, when actually ich treatment needs to be continued for a good 2-3 weeks to effectively kill the ich. That's because ich is only killed during it's "free swimming" stage. Here's a few articles that are pretty good and explain it in more depth:
http://www.peteducation.com/article.cfm?cls=16&cat=1791&articleid=2421
http://en.wikipedia.org/wiki/Ichthyophthirius
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