i got a new rheostat and have the probe under the substrate. when the rheostat is turned down as far as it will go before turning off the temp is still in the high 90's or a lil over 100. inside of her hide its around 92 or 93. she doesnt dig in and get onto the UTH but if she does do u tihnk it will burn her? should i get a better rheostat? or should i just leave it and not worry? thanks