'curing' ich with heat is a bit of a misnomer in my view. Heating the tank to well above average temps for most fish, simply accelerates the life cycle of the ich parasite, dramatically shortening the time the free swimming stage has to find and infect a host. So depending on tank size, fish load, and parasite loading, heating, while one approach, may not work as well as copper or other meds, and may contribute to stress for a diseased fish.
I generally treat my quarantine tanks with copper sulfate, which takes care of any parasites typically, but reserve the use of antibiotics for actual, observed infections or diseases. All too often parasites have made it through quarantine with no apparent symptoms, only to appear when placed into the display tank.