What are the symptoms?
Coppersafe is not the best copper to use, Sechem's Cupamine is. It is a lot easier on the fish, and much more stable. Standard copper treatment is 3 wks, but I believe that Mardel recommends a shorter time for Coppersafe. The downside to Coppersafe, aside from its harshness on fish tissue, is that the manufacture does not guide the hobbyist to use copper testing, which, imo, is necessary when using copper treatments.
Copper and Chloroqine diphosphate are the only medications that are effective for treating amyloodinium. Hypo will not work with this disease.
Can you post a picture of your fish...close up?