DON'T PUT ANY MORE IN!!!
Wait a few weeks (3 or more) with the water temp at 82-85 and do water changes as often as you can (no less than every 7 days). Don't for get the epsom salt either. You can find it at local stores for less than 3 dollars. Add it every time you do a water change and every day in between. This process will kill the ich in your tank. Hopefully you will do this for 5 weeks or more. It's labor intensive, but worth it if you really want them to live.
Once you think you have it ready, buy some small ones and add them to the tank to check for ich (keep the temp high!). If they do fine then you know it worked. If it doesn't work, start over and try again.
Make sure you raise the temp over time. I raised it one degree every 3 days. It may already be high because of the weather though. If so, make sure the heater is adjusted so that the temp doesn't drop. It worked for me, I hope you have the same success.