there are some mericale cures, but non have realy been proven. Hyposalnity would work, but they will kill all other inverts, and could affect the bacteria on your lf and such, kill off your pods, ect. It is recomended to be done in a seperate tank, while letting the ich starve in your display. Garlic foods like using garlic extream and garlic guard suposedly help in preventing it. but once again, not proven, just observed. But if it doesnt work, it still has some good vitamins.