[cypher]

I would definitely put more substrate in the base, even if you don't see him digging or burrowing he needs more than that, I think having a greater depth of substrate makes them feel safer as well as providing the opportunity to dig if they want to.
The house that comes with the cage is pretty useless really you could just ditch that & put something he might make better use of on the shelf, a cardboard box would be better than the plastic house or you could put the sand bath up there & with more substrate he might make more use of that space under the shelf.
The cage is quite .tall so if you can afford to buy any new things you could maybe get something like lava ledges or small wooden ledges to attach to the bars for him to safely climb on.
Hope that helps a bit.