I just recently finished a fallow period on my display of 10.5 weeks. It seems like it would take forever in the beginning but life goes by quick, so it did not feel all that long in honesty. I haven't seen Ich since fish have been added back in, and lets hope it stays that way.
I went to use Copper once, and I did not like it. I am a person that likes to avoid chemicals if I can. I started adding cupramine very slowly originally with the Achilles and he freaked out. So I trashed using copper after that.
I performed Hyposalinity on my Achilles tang, Tomini tang, Yellow tang, 5 chromis, and 2 clowns. It worked great other than the clownfish jumping out of QT (I should of put on a cover). Hypo is fairly easy if you do it in a larger than the norm QT. I used a 40 breeder and a 50 gallon, I never found myself struggling to keep the salinity where it was needed.
However, there are also strains of Ich that are not killed by Hypo. Right now I am preparing to do the Tank Transfer method. It's fairly easy and supposed more effective than Hypo. Using tank transfer also allows you to get the fish Ich free in a shorter period of time. You need two sets of equipment in order to perform it, you could use 5 gallon bucks with small powerheads and heaters if space is limited. I would recommend going with larger for bigger fish.
It works as such:
Day 1: Acclimate fish into pre-setup QT
Day 4: In the morning before the lights come on, Transfer the fish in the first QT into the other with as little water as possible. Make sure salinity and temperature are matched. (Drain and clean out the previous QT and equipment with white vinegar and let it dry.)
Day 7: Repeat
Day 10: Repeat
Day 13: Repeat, conclusion.
Monitor the fish for a week or so afterwards just for assurance. I would use this time to treat with Prazipro as well for possible internal parasites.
The Tank Transfer method uses the parasites life cycle against itself. In a nutshell, the parasite is on the fish during the day feeding. It removes itself at night, you are removing the fish before it can re-attach.