Ich is actually a parasite and not a disease
The parasite can proliferate without killing the host as long as the host is strong/healthy enough to keep fighting them off. You may not even notice them continuing their cycle. If you've had ich in your tank your best bet is to hypo the fish that you've got.
Use 1 week to get the salinity down, 6 weeks at the lowered salinity, 1 week to bring the SG
back up to speed and 1 week for insurance.
If you've moved anything back into the main your fallow starts all over. Nothing into the main for at 6-8 starting today! Those inverts could be carrying some stage of ich with them.
Good luck! Watch your PH
& ammo (even if the tank has been stable as the drop in salinity could cause a new cycle).
Join the NJ Reef Club
Today! Saving the world's reefs one living room at a time!
Atlantic City, NJ September 25-27, 2009