H. Arizonensis enclosure

My arizonensis has not created any burrows

False bottoms normally work better with deeper substrate, as sand soaks water so well that it will likely all just become the same consistency and then set rock hard especially with that (presumably) heat lamp over it. I tried a false bottom sand setup for my U.Yaschenkoi with about the same depth I can see here and it absolutely hated it, never burrowed, and got sand stuck all over it's feet. May I suggest adding a 2-3cm layer of cocopeat on top of the pebbles if you decide to redo the setup, ive found that it helps prevent the sand sucking up all the water you add at once and will hold that desired moisture gradient a bit better for a while. Other than that, the layout looks nice.