Raising the temperature helps speed up the fallow process.
Yes - it does. I think @threebuoys thought you meant raising the water temperature of the tank with the fish in it. We need to be careful not to tell people to raise the temperature in tanks with marine fish that have ich - that's a disaster waiting to happen! Raising the temperature with freshwater ich helps, but that is a different species. 84 degrees F. is like the prime reproductive temperature for marine ich (grin).