Welcome to TPT. Copper is just as deadly on freshwater inverts as it is marine inverts. You'll want to avoid that one in a tank that will ever house shrimp. My general go-to for freshwater fish parasites in a shrimp tank had long been API's Quick Cure (malachite green and formalyn), but it's been off of the market for a few years. There are some weakened versions of it that can be purchased, pretty sure Ich-X is one. Should be just as effective, just costs much more when you go from a drop per gallon to a teaspoon or so per 5 gallons as I seem to recall the dosage being.
The shrimp in all likelihood shouldn't be a host, so treating in a QT for 90 days in theory would do the trick and the fish shouldn't be re-infected upon going back in.
Nothing good happens fast in an ecosystem.