Sting,
I think you may be working backwards. You should remove all the fish from the tank and leave it Fish Free for 3~4 weeks. The parasite will die off w/out a host. Treat the fish with Cu (or hyopsalinity, or what ever) in a different system/tank that is as bare as can be. If you use Cu on your main tank and have calcium substrate or base rock, you may never be able to keep inverts in it again. As the substrate will absorbd the Cu and slowly release it over time.
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