Snapper, as stated by myself and several others in your
last thread on this subject, (did you even read your responses?) running copper all the time in a display tank is not only unwise, but a poor fix for inadequate husbandry practices.
Quarantine your new arrivals, and you have no need to medicate your display tank - ever, let alone all the time. To even suggest such a thing is silly. Stores do this sometimes because they are getting in new fish weekly, and the fish move out (or die) quickly. A smart store owner just runs his tanks in a constant state of hyposalinity. In any case, you are not a store.
Copper is TOXIC, not only to C.irritans, but to the fish themselves.
Read parts one through five of this article
http://www.marineaquariumadvice.com/aqu ... ish_1.html
There is absolutely NO reason why you can't keep these hardy, bullet proof, most easily maintained, trouble free fish without constantly medicating. Normally I tell people that you have to hang a grouper or a trigger on a clothesline to kill it. :|