#emperorangelfish

First post. Help me save him! He's been in copper power at 2.00 for two weeks and kanaplex for 10 days. 0 amonia, 0 nitrite, ph 7.9, 1.023. I did a 100% water change when I saw his condition worsening and he now has no medication. It seems to be just his skin. He behaves withdrawn and swims...