I will chime in here on the salt issue
Using salt depends on the fish you have. Mollies are brackish water fish and do better with some salt in their tank, so using salt for the ich in a quarrantine tank is not necessarily a bad thing. The salt combined with the higher temp will help the ich issue. Frm what I have read, been told, Mollies are prone to fundgus and ich issues. The added salt for them helps guard against these issues.
Now, if your main tank has fish that dont' like salt, or you are running a community or have live plants, then just increasing the temp is the better way to go.
While I have a Molly species tank set-up, I still prefer to use the API ich cure. I have found in the past that this works better than the rise in temps and doesn't seem to stress the fish quite as much. Granted, you have to put up with the greensh colored water for a couple of weeks until water changes and the carbon take it out (if you use the ich cure, remove the carbon media before treatment).
There is debate as to whether or not the ich cure hurts the bacteria colonies, but, I have yet to have to recylce a tank, or suffer an ammonia spike, after using it.