well, after my last post on july 9th, i gradually increased the heat to 86. the fish that i could see ich on were the cherry barbs and the two platys. i couldn't see any spots on the bloodfin tetras, any of the 3 cory species, or the albino bristlenose pleco, although it would be hard to see them anywayz on him. i left it at 86 for probably 5-6 days. the platy's lost the spots, but about half of the 15 cherry barbs got hit really hard, and a few of them were covered in spots. about 5-6 of the cherry barbs died. i increased the heat to 88, and it's been there for the last 5-6 days. now none of the remaining cherry barbs have any white spots, and neither do any of the other fish. no other fish have died due to the heat increase. i plan on keeping the heat up another 2-3 days, and then letting it drop back down on it's own to 80, which it will remain until summer is over. and hopefully that 2 week stretch of warmer water gets rid of the ich.
and i also did 20% water changes every 2-3 days.