I don't buy the every tank has ich. You kill it off 100% it does not come back. In the wild the disease can not overcome a fish like it can in the confines of a tank. Reef fish fight it off well and they come from localized areas, but for example my Mappa Puffer does not handle it well like the other tank mates. I am sure his habits don't get him a case of ich in such large numbers? Until they prove a good that comes out of ich, I plan to remove it.