Go Kelso go Kelso. woop woop
Ich, the parasite, is unaffected by medications until it leaves the fish. Higher temps speed up the life cycle of Ich. There is about a 3 day window to get the parasite killed with meds before it surrounds itself with a secretion in the gravel after leaving the fish and respawns to attack again. Once back inside the fish it is untouchable by meds in the water. Thus the longer treatment regimen and recommended raising of temp. Just an fyi. While ich is stressful as is raising the temp, the higher temp is not as much stressful as most tropical fish can handle the higher temps. Lower temps extend the ich life cycle.
http://freshaquarium.about.com/cs/disease/p/ich.htm