You could use that on the exo terra but I would use it for the daylight bulbs that don't put out a
lot of heat like the CFL bulbs. because they would be kinda close to one of the plastic supports on the top.
The deep dome fixture I have are small enough that they can rest on the metal screen and the heat doesn't
bother the metal screen.

And to answer your request on care and substrate,

White's Tree Frog Care - Litoria caerulea

I Would use eco earth it is a coco fiber that looks like dirt but it is much easier to clean
and replace.