Im doing copper treatment in my hospital tank. I bought Cupramine from Sachem and Sachem test kit. The treatment level of copper should be 0.5. There is a reference solution with the kit that when you test it it should be 0.5 too. That way you know the measurements are right. I did that reference solution and it shows 0.6. It is a big difference. 0.6 is dangerous for fishes i think. Anyone has that problem in past? Should I keep copper level at 0.5 or should i go with the reference solution and keep it at 0.6 witch may be 0.5 in reality?:-/ Thanks.