Wrasses can handle chelated copper better than ionic copper. Coppersafe and copper power are the preferred copper medications for treating wrasses. The protocol for treating wrasses with copper is dosing to a therapeutic level of 2.00ppm with either coppersafe or copper power for 30 days. Unless absolutely necessary I don't like dropping wrasses in full copper. I dose to 1.00ppm add the wrasses, wait 12 hrs, then dose again to get the copper to 2.00ppm. A hanna copper checker is a must when dosing copper. You don't want to run your copper too high or too low, keeping it at 2.00ppm is key. Then after completion of copper treatment, it's recommended to do 3 rounds of prazi to defluke and deworm them.
It's a lot of work to prophylactically treat fish. Some of us on this thread no longer treat prophylactically bc we've been in the hobby a long time and can mitigate our risks, but if you're new to the hobby I would recommend either QT'ing your fish or paying for QT'd fish.