Here I go again since I been battling a parasite which acts like ick for several years with copper power at which last treatment was 30 days at 2.25-2.50. it appears for about 2 months that I finally got rid of the parasite. Well its back, once I remove all the copper for DT which is fish only it comes back with a slow but strong vengeance. Is there a level I can leave copper power in permanently which won't harm the fish. I have asked everyone for any other ideas for treatment but to no avail. Hypo several times didn't work either. Should I change to copper safe this time or stay with copper power. Thanks for any input on this matter I really appreciate it. Open for suggestions!!!!!!!!!!!!!!!!!!