Also, I got newspaper as substrate. I have a thermometer probe on the hot spot in EVERY tub (NOT THERMOSTAT PROBE!!! LOL!) I noticed that the reading is very different when the heat end of the probe goes up or down so as I was testing the temps I taped the thermometer probe cable down on the newspaper. (THERE ARE NO SNAKES IN THERE YET! YAY!) So, for those of you who also use thermometers in the tubs, how do you secure them onto the newspaper? (YES I HAVE A TEMP GUN TOO but want to check with a glance sometimes instead of disturbing the snakes by pulling the tubs out every 20 mins).