Yes, I use flexwatt heat tape with a thermostat & digital thermometers... Nerissa is currently in quarantine, but has her own strip of heat & a ZooMed thermostat. I also have a temp gun, so I'm 99.99% sure the temps are right-on.It's actually a bit cold in their tubs (ambient), since my room/house is freezing cold all the time - so if anything they need MORE heat.