couple qt ??'s

[cuz]

so i have my qt set up and running with cupramine right now eradicating any ich that might exist. My display will remain fishless for the recomended 8 week term before anyone comes out of qt. Now my question is...once the cupramine treatment is done what do i run in the tank. Throw some carbon and water changes at it for the last half of the qt procedure, because the cupramine treatment is 2 weeks but fish will be in for 8weeks? also after everyone returns to the dt what to do with the qt thats had cupramine run through it? I'd like the tank to stay running as a ht/qt or even if the cupra can come out a frag tank would be handy??
do i completely drain it and any hardware thats contacted cupramine, or can say the hob and skimmer be saved for a frag tank application?