I have an exo terra 36x18x18 for my big normal male.
I used to have it heated with two 11x17 heat pads and a 60 watt ceramic heat emitter. I also have a single repti glo bulb fixture for viewing light. The heat mats were set on separate thermostats so one heated the floor to 92 and the other to 82.
It worked fine, but I discovered it stayed around 78 even without it and the snake is healthy with just one mat and the heat emitter.
Definitely get a bulb or ceramic heat emitter to heat the ambient air because that's a big open tank. I also covered the top in foil and black duct tape everywhere except below the heat lamp and daylight.
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