From Humblefish Aquatics forum........
Option B - Everything works the same as "Option A" except the fish is transferred into another QT (or holding tank) after 2 weeks. However, the following "rules" must be strictly adhered to:
1. Only the fish gets transferred, nothing else.
2. DO NOT lower the copper or Chloroquine level prior to transferring.
3. The "holding tank" must be at least 10 feet away from the QT, Display Tank and all other saltwater aquariums.
4. The two week countdown does not begin until copper or Chloroquine have reached therapeutic, and have been maintained at therapeutic throughout (very important!) So, it is wise to test your copper level often.
5. Prior to transfer, the fish should not be showing any signs of ich, velvet, brook or uronema. If he does, don't do the transfer!
The above works because parasites can only stay on a fish for a maximum of 7 days, and the presence of therapeutic copper + metro or Chloroquine shields your fish from reinfection. (The additional 7 days allows for some margin of error.) Any parasites the fish was carrying will have dropped off and are left behind in the original treatment tank. (So the QT that the fish is transferred from may still be contaminated with disease for some time.) After transferring you may deworm (if you hadn't already done so in QT#1) or dose other medications as needed. I recommend observing for at least 2 weeks before transferring any fish to your display tank.
Don’t hesitate to make changes to your treatment plan as needed! For example, if you know a fish has flukes treat with Prazipro or General Cure first. Notice white stringy poo coming out of your fish? Start food soaking General Cure, using a binder such as Seachem Focus to reduce the loss of medication to the water through diffusion. Seeing signs of a bacterial infection? Treat with antibiotics straight away (you can combine most antibiotics with copper or Chloroquine.)