Copper is, according to what I read, not a good choice with scaleless fishes. It also depresses appetite. Hypo, correctly administered, will require a refractometer, an ATO or a lid to prevent evaporation, an ammonia badge, Amquel, an air pump, air diffuser, and a strong pump, not those weak hang-ons, with floss filtration changed daily. Hypo's lesser rep has a great deal to do with trying to do it without proper gear. OTOH, it does not depress appetite.