To kill ich you need 3 teaspoons of salt per gallon or 1 tablespoon per gallon to make a 0.3% salt solution. I would turn the heat down to 82*F (even though ich can reproduce at those temperatures the salt will kill it the ich). High temperatures are very stessful for most fish and if you combine it with high salt, you could see some problems. Leave the salt in for 3-5 days after the last spot dissapear and then start doing 40% water changes every 2nd day for a week or so to remove the salt. After that you can resume your normal water change schedule. It normally takes me 7 to 10 days to CURE ich with salt.