I agree that ich does not kill fish immediately and they can survive with it for long periods of time. However I disagree that ich is in every tank. I have never had the presence of ich in a marine tank and I am thankful for that because it is apparently so much harder to get rid of than fresh water ich. I only got ich a few times in my cichlid tanks but super ich cure this blue stuff worked pretty well and it was only a few bucks at wal mart.
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