With my tub setup, I personally like to use EcoEarth and sphagnum moss because it does amazing at keeping the humidity up (90-99% for my BRB). Without the substrate, it was difficult for me to keep humidity up. For snakes like a BP you may not need to keep it as humid and you can just not use as much sphagnum moss and go linger periods of time without slightly dampening the substrate. As for the heat mat, I have my probe inside the tub through a small hole, and under the substrate (with there NOT being much substrate so it doesnt make a difference in what the snake feels) in the warmest spot, I only set a few degrees higher because it will stop it when it is right. For ambient Temps, I use a heat lamp about 12 inches away from the enclosure with a 75-watt infrared heat bulb with another thermostat. The probe is sectioned to the top of the lid on the outside, and it raises the ambient Temps to where I need them perfectly without having to make too many changes.
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