I know that this doesn't help you now, but I just QT my fish in copper (safe) for 3-4 weeks. Just a simple small craigslist tank on the floor in the basement with some bio, a light and a heater will do - I use a 58G with a CPR Backpack, a UGF and a heater.
Running without fish in the display is a good idea to knock it down to nothing... for a while.
I am a believer that no tank is ever 100% ich free if you ever add anything after the fish, unless you keep your new inverts in a fish-free tank for 60+ days - there is enough water on frags, rock and especially inside of clams to bring in new ich. What is important is that your fish are healthy and stress free so that they can fight it off IMO.
Most of the stores that I have been to in my range north of I-70 don't use copper in their fish systems. This is new to me being new to town... most of the stores that I am used to always used copper on their fish... which is not as good as in-home QT, but better than nothing. They also never put fish in their invert systems.
For now, garlic is your best bet if you cannot get them out... and even trying to get them out might stress them enough to kill them.