Also, 100w bulb is WAY too hot. It made my 40 gal tank overheat, I can't imagine how much it would overheat a 20 gal. It also destroys humidity. My 4o gal uses a 50w for nighttime and a 60w for day which even gets a little too warm and makes ambient go into the upper 80s. What wattages work for winter won't when it gets warmer depending on your location.
Use a way lower wattage of bulb (if you still need them with the REGULATED UTH) and insulation. Exo-terra foam background that looks like rocks, using corkboard on the sides, plexiglass on the top, whatever way you may find, and work on retaining the heat from lower intensity sources. It'll make humidity better doing it that way as well. It took me about a month to experiment (before even buying my BP) to get temps right. Aspen may not keep it humid enough either.
First and foremost regulate that UTH (try an Inkbird or Jumpstart thermostat to be more economical if you'd like), set the target to about 89-90 (temps get a couple degrees over before it shuts off to cool) and monitor with a cheap but super useful temp gun. Also try to cover the glass touching the UTH with something like paper towel that he can't move and dig through, direct contact can mean almost instant burns. My guy's belly was getting a little pink through two layers of paper towel because the thermostat probe came loose and the mat was around 100 degrees. Had the towels not been there, we would both be in serious trouble. I know aspen is easy for them to wiggle through, especially if they shed in the hide.
Apologies if any replies sound demanding, heat is just very dangerous for these guys and UTH's can cause real damage if not regulated.
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