Brent, thanks for the comments. I am hoping the vent holes are enough and where the light sits there seems to be plenty of room for good ventilation btw that big hole and the six 1 inch holes but only time will tell. With the probes I have the Hydrofarm thermostat probe taped to the bottom of the UTH on the outside bottom of the tank and set at 95. And then I placed the accurite probe hotglued down to the inside of the tank above the UTH. That way I can see how truly hot the UTH gets if the snake burrows down in the substrate. With that setup I am getting 91 to 92 inside tank temps over the UTH. Hope that explains it a little better.