Here, here Argentra!

The office clips would work for a while on the tubs, but won't work on screen lids and tanks. You need to get the metal clips that sort of snap on.

With aspen, your thermostat and thermometer probes need to be under the bedding and on the glass so that even IF he burrows, he won't get burned. When I had a heat lamp on the top of Flurry's 10g tank, the thermostat probe was inside the hide.