How are you measuring those temps? The reason I ask is because those heat mats can reach temps over 100 degrees. Without a thermostat to control the heat mat you may have temps that are way too high. You want to shoot for at gradient of 92-94 on the warm side and 82-84 cool side. Try not to let those temps drop under 80 degrees.

I agree with Judy. Let the little guy settle in for a week, and don't try and feed more than once a week as it can stress it out. Also look for smaller hides, and maybe even consider putting paper or something around the back and sides of the tank. Throw in some foliage to provide some cover, or even some loosely crumpled up newspaper will work.

Congrats on your getting the little guy. I hope he/she settles in well for ya.