Ok I cut out a bunch of cardboard and taped it together I also made some hides for him with cardboard. I couldn't figure out which insulation it was but I did get the tape you would talking about and taped the UTH to the glass at the bottom. For some reason the UTH probe has a 5 degree difference to when I hit with a temp gun (at the glass with no substrate inside the cage). I guess because it goes through the glass? Let me know what you guys think. I just finished so I'll check the temps in an hour. I took the snake out for the time being. Is it ok that the tape smells a little, it won't harm the snake right? Thank you everyone for taking the time to help me lol!