I would ditch the copper and do TTM to clear the fish of Cryptocaryon.
Formalin baths during the transfers will take care of all the other protozoan parasites: Amyloodinium, Brooklynella, Uronema, Trichodina, ... It will also take care of flukes and most crustacean skin and gill parasites.
PraziPro while in the tanks will clean out most intestinal parasites.
This way you get your fish clean in 2 weeks. Add 4 more weeks of observation in QT to see if anything slipped through and you are good.