I have a hippo tang in Curpamine right now. He has been in copper for almost 3 weeks now. He still scratches like crazy even though I have not seen anything on him for weeks now (PVC tube in tank). He also is starting to develop HLLE at a very rapid pace. I have had very tough luck with HLLE affecting everything I have been QT'ing and it happens very rapidly. I am not sure what to do anymore.He is in salinity of 1.011. Does the Cupramine cause irritation causing him to scratch?