the probe is down the hot end positioned in the middle,
i am using stick on dial types of thermometers
I would suggest getting digital thermometers and hygrometer. They are more reliable and give a more accurate reading of temperatures and humidity. The dial type have been known to give inaccurate readings...
Ok. You need to keep the warm side temp at 33-35 all the time. It's ok if the cool side temp drops down to 24-25 at night but they need a way to thermoregulate. If the cool side temp is dropping below 24 at night, then you might need to make some modifications to your tank to keep the temps up...