Just be careful that the ich isn't just going through its life-cycle rather than being killed off completely. As you probably know, it can only be killed when it is off the fish, not when it is protected in the white cyst you see on the fish.
I have a very resistant strain of ich in my tanks and even though my tank has been at 86 degrees for well over two weeks now it has had no affect on the parasites. Apparently some strains can survive temperatures of 90 degrees now.
Sometimes people think they have cured it, but then it crops up later down the track because the parasite wasn't killed off completely. I have found mild infections usually only show up on the pectorals and other fins of the fish so make sure you check these areas carefully to ensure the ich isn't still present in your tank.