[Bruce]

The slow progression would not be a sign of it not being ich. Ich will always be in your tank to some extent. But when fish are healthy the ich is not able use the fish. If the ich progression is slow, that might mean the fish's immune systems are fighting back...but its a slow battle the fish will likly lose without help. I would do a water change in the QT tank, and wait a few days to a week to see if the ich comes back.