Michelle.C is right on a lot of things but you want the surface temperature at 110-130. For hatchlings I would keep it a 110 since they are a bit more fragle then an adult. I strongly suggest getting a Pro Exotics temp gun!! With shipping it is around $30 and trust me it is a required tool for any monitor, tegu, or herp. Shedding really won't affect a monitor's diet unless they aren't shedding properly. Make sure the humidity is around 50-60%!! Your monitor might be dehydrated the best way to chek for that is to gentle pull the skin on it's back and if it does not return back right a way you need to soak your monitor asap and get the humidity correct again.