Hey Robin,
There are a couple of different ways you can connect the stat probe, the way you have it, and putting it inside the enclosure. If you use it the way you have it connected, the thermostat temp setting will have to be much higher than the desired temps inside the enclosure. Remember that the temp on the heat tape is going to have to go through the glass, through the aspen, and to the surface (ground) of the aquarium. Look at Adam's journal as far as husbandry during breeding goes. His heat tape is set to 98, when his hot side temps are 92-94. He also heats his room to higher than "normal" living conditions though. So you may well have to set your stat to 100 or over to get the desired warm side temp readings. The way I have MY accurite set up, is I have the unit exposed on the cool side of the aquarium, and the probe is inside the warm side hide (laying on the aspen).
Hope this helps.