When one of my fish had ich awhile ago, I "dipped" it the same way I said in my other post, and after the second time I did it, all the cysts came off. After the first time I did it, about half came off. I also treated my tank with the Quick Cure, took out the carbon in the filter, cranked the temp up to about 82-83, and added salt. No other fish showed any signs of ich.