Hey guys, unfortunately Ich has wiped out my entire show tank as Canada has banned all copper-based medicine. I was finally able to get some copper power and have put in 110ml which is supposed to give me 2.5ppm of copper. Although, when I tested it with API copper tester, it gave me a concentration between 0.25 and 0.5ppm. Is the tester wrong or is the concentration wrong? I have no clue where I'm going wrong about this! This is the second full tank that has been wiped out by ich, please help!