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CP = Chloroquine phosphate: https://www.reef2reef.com/threads/chloroquine-phosphate.192309/
A water conditioner, such as Prime, has the potential to change Cupramine (for example) from the safe Cu2+ form to a very toxic Cu+ form. This information comes directly from Seachem Tech Support, who makes both Prime & Cupramine. This negative interaction doesn't seem to be as severe with chelated copper (ex. Coppersafe), but I still wouldn't chance it.
Hmmm, ok gotcha. I've never been a fan of cupramine, but I've been using coppersafe and prime in conjunction for a number of years which is why I was confused. (Doesn't seem to have any negative affects on sensitive fish, IME. Even used it on Macropharyngodon and acanthuridae. Everyone seems to be fine even after long term exposure (30 days)).