I slowly ramped up copper power over 3 weeks as I have wrasses and copperband butterflies that are senstive to copper in display. I have finally reached 2.5 ppm but it has been at therapeutic level of copper above 1.5 ppm for 2 weeks. I still see ich on multiple fish as well as flashing and rubbing against the rocks. Did I give ich too much time to adjust to copper as well. At what point should I see ich dots go away?