Unfortunately it had passed when I woke up this morning.
What's left in the tank:
Tomini Tang (the last surviving fish from the Dr. Reef's order)
Lubbock's Wrasse (model citizen, one of the first fish introduced into the tank ~6 months ago, looks and behavior is great)
Diamond Goby (same as wrasse)
Purple Firefish
Handful of inverts - urchin, shrimp, snails, hermits, emeralds, etc.
Is there way I can treat in DT? H2O2 dosing with a UV sterilizer?
I can setup a QT with copper, but I'm positive I'd have to completely tear down my DT to capture the inhabitants.
It is unlikely that you will be able to manage ich in a tank where fish have begun to die from it....the ich parasite multiplies geometrically, and when it hits a certain number, it goes out of control without proper treatment.