Thank you for your response.
He already has an UTH for basking, this strip of heat tape and aluminum tape is just stuff I have on-hand from when I bred dubias. What you say makes sense, and should have been obvious. I'll put it underneath- with a thermostat of course.
He does have a decent sized water dish- which helps. I wish I could put a humid hide in as well, but a 10 gallon doesnt provide much room. I'll look into getting substrate for better humidity retention.