Copper does nothing for fluke. Do fresh water dip for 5 minutes, that will give respite to fish temporarily as it will knockout flukes from gills. Try to use black container, fluke turns white color in fresh water so you will be able to properly diagnose if it is not flukes. Then treat with Prazi Pro or Prazi Gold in separate QT tank. Prazi acts very fast, will clear fluke withing 24 hours but you still need to treat for 5 days. change 50% water, give 2 days break to fish and dose again. 2nd dose will cover the complete lifecycle of eggs that survived 1st treatment. That should be enough.