I hate to beat a dead horse, but I have to agree with all the above posts....Although I do not keep discus any longer, I used to breed them (My avatar is one of my breeder females that I raised)......I never had ich on any of my discus, but I also performed water changes every other day (At a minimum). Keep up the water changes, keep them warm and you will never have a problem keeping beautiful discus.....Enjoy the hobby.