None of the fish in either of my QTs are showing signs of parasites since the 3rd day of treatment... But I have worked to hard keeping my DT completely parasite free to risk putting a fish in there that hasnt done a full quar. process. They have only been in QT since the 1st, so they have only been in copper for a week, half the recomeended time. Adding a fish to my display at this point sounds like a recipe for disaster...