I'm using some stick on round gauges on both sides 1/3 way up on the back of tank to monitor temps. I've read all the caresheets and tank setups I didn't like any other enclosure at the pet store the log is temp. I have one being shipped will get another identical for cool side. My problem is the uth is getting the glass under the coconut bark to hot even with the rheostat on low. The rheostat is working. Tested. What thermostat would you recommend that I can put a probe in the tank on the glass that I can set to turn uth off and on to keep at selected temp?