Heat is the best way to do it. Raise the temp by a degree or 2 every hour until the tank is at 86 degrees. Keep it there for 2 weeks after the last sign of ich goes away.
Melafix and pimafix won't do anything for ich.
They will be fine.You think the fish I have can handle the heat? If no action is taken, ich will kill all the fish for sure right? Darn, the heater I have is the kind that only keeps the tank at 78 all the time, no adjustments. Looks like I'll be getting a new heater!