in the future do yourself a favor always treat your fish in a QT tank. that way you dont have to try and get the meds out. Be real careful putting anything in your tank, read read read before adding any inverts or corals. Some will say if you have ever had copper at any time do not add this species etc. This is certainly not the easiest way of doing it, but probably by far the best in the long run would be to set up a QT tank, let it cycle, then move your fish into it. Drain, clean, and restart your your display tank, and do not reuse your substrate etc. I would just worry about the problems you could have in the future. Having only dasels this might be the best time to do it before you have fish that cant all go into the QT at the same time. Their may be better options, but thats the best advice i can give. certainly better than putting hudreds of dollars in live rock and coral and having them possibly die.
