[i have crabs]

bout time thier was some good news, so you have all the fish in the qt now?,

my2rotties-
never heard of people treating with copper while acclimating new fish, i have no idea how long it takes to have any benefit, i dont think it would do much in that ammount of time plus your exchanging water which would dilute the mix almost to nothing,
if your puting the fish into a qt just treat them in there, im not one of those people who have seperate qt and hospital tanks seems a bit stupid to me to put a fish in a tank you dont want to medicate.
the way i do things is the fish gets added to the qt, usually 1/2hour or so, streching out the process risks oxygen levels dropping and i think thats what kills alot of new fish, once the fish is in the tank ill give them a couple days to adjust and get eating if all looks well or ill start the culpramine right away if they look sick at all,
i used to do fresh water dips also but i cant handle the stress and never seen any benefit to doing it, maybe if the fish wasnt going into a qt for some reason i would do a fw dip.