To southernboagurl: that temp 97 is on surface of that mat. So on substrate should be less... However I have still just one thermometer with probe and just moving that probe to check temperature on both ends... I know it's not ideal, just waiting for another thermometer. That light I use from 7am to 8pm every day (switched on/off with timer).

To anatess: thank you so much . Your post gave me this idea

To Spaniard: Good point about that burrow down... I will move sensor to the glass. Thank you.