My BP is using an RHP at the moment, but I also have a second thermostat hooked up to a UTH for him set a bit higher... that does raise a very good point. I'll stick to more traditional substrates for my BP, then. Thanks for that!

For the potential bearded dragon, how is cement-covered foam or styrofoam as a cage bottom? I've been considering making a plastic enclosure and covering the sides and back with great stuff and cement. I could make a similar piece that is removable for the bottom and not really have substrate per se, but just wash the floor... Would this work?