Thank you both for the useful information. The substrate I currently use is simple newspaper, and of course that gives no thermal mass at all. My glass tank has a strange top which is made of glass with a mesh cut in the centre; this makes it impossible to add a heat lamp as the mesh cut is only 2 inches wide. I believe that my options are limited to adding another heat mat in the back of the tank, but this time choose a heat mat that does not only heat with Infra Red heat (such as the ones from ZooMed). I will also try to add some objects in my terrarium above the heat source which will act as thermal mass.

Thanks again.

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