Mooch! I thought we talked about this (happy posts remember!

)
As for the temp issue: 86 degress - if it kills off any strains of ich - really will only serve to accellerate the life-cycle. This wil make the ich reproduce and thus affect your fish more, but also too allow you to target their life-stage that we can treat more readily.
Everything that I have read and discussed with local aquariests have all indicated that 96 degrees is required to kill off ich, but of course most fish will die at this temp as well over a short period.
As for the Cories and the use of Salt - Yes you will be fine. I have done many times regrettably, but 2 things to be concerned about...Acclimation and Duration.
1) Ramp up your concentrations
slowly and back down again slowly! *Most definately pre-mix before adding salt*
2) Try to irradicate the ich quickly (within 2 weeks) and the Corys will do just fine.
Look at my Avatar and Sig...I have never lost a Cory to Ich or the treatment of Salt. I will however say that my Corys
definatelty showed signs of stress when I salted to quickly (I take 36 hrs to ramp up my tanks now and they show no signs of distress) or when I farted around with 1/2 doses of salt hoping that would work and it took me 3 weeks to treat...
Signs to look for are lethargic behaviors (probably the most common), followed by lack of feeding or lack of interest in food, paling in color, staying near a heater, etc. (Again, all symptoms of practicaly any infection...)
One last thing, raising the Temp shuld
only be done after the salt (treatment) has been introduced.