After losing an entire tank to brook, I'm changing my QT methods and am looking into using CP. Has anyone ever used it? It's supposed to treat the big 3, ich, brook and velvet. One of the best things about it is that you only have to treat once and the meds stay in the tank at the proper concentration, unlike copper and formalin. I just purchased some on ebay that will be here Wednesday. I'd like to know anyone who's ever used its experience. Thanks!