You need to get a thermostat to regulate the heat pad temperature. Make that a top priority. To offer the correct humidity you may want to try using eco earth coconut fiber for substrate or spray the tank down with a spray bottle full of water. I have a 40 gallon breeder that always hovers around 50% humidity with the eco earth, and it isn't soaking wet to prevent scale rot.
For now why not buy a heating lamp and partially cover the tank with foil to retain heat and humidity.
What are the temperatured inside like? I think 40C is way too hot. Have you checked out the guide to setting up a glass tank? If you go to the last page of that thread, TheSerpentMerchant has added lovely pictures on how to do it and it has worked beautifully for me.
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