I keep mine in a 15 qt tub with belly heat. I think it's okay to have belly heat as long as its only in part of the enclosure. I've also read that you need to be careful with it because they generally burrow down to cool off. I much prefer the tub + belly heat compared to the tank and lamp I had. The lamp dried his dirt out way too fast. I know Deborah also has a pacman in a tub, but I'm not sure if it's on belly or back heat. Hopefully she'll help you out!
ETA, if it stays at 80*, I don't think you'll need extra heat. I'll let someone else chime in to be sure.
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