My emperor angel is around 6-7 inches. He currently is doing very well eating great but have noticed some black dots near his face and some on his body. I believe it is black ich or what they consider black ich. I believe he also picked up white ich. Have treated the main tank with copper. FOWLR. I recently decided to give him a freshwater dip (lasted about 2 minutes) and then put him in a seperate tank (29 gallon) with copper in there as well and salinity is around .021 I plan on lowering it gradually. What else does anyone recommend? Or what do you suggest good salinity and amount of copper for this species?? Recommend more freshwater dips? Thanks, Adam