Hi. That's true, not all cories can handle discus temps. I tried Pandas which lasted about 6 mos. I know others had the same experience with Pandas, but some had Pandas that did okay. I have a Jullii (spelling??) for almost 2 years and he's done well. My Discus tank is at 84. Sterbai I believe can handle the temps and I believe there are a few more. If you don't know what yours are, I guess you can try them but keep in mind that they may not fare well down the line.