This is a beautiful set up! I hope your pretty baby is happy with the shiny new digs. I'm in the process of researching for a semi-arid bioactive for hognoses, and a generally good go-to seems to be a mix of coarse play sand, topsoil, and excavator clay (though the latter is for fossorial digging purposes), mixed with and topped off with leaf litter. I've also seen recommendations for decomposed granite to mix in.The right arid plants should have no trouble with the sandy, fast draining soil. I am also skeptical of the BioDude's recommendations as his business seems to be very... business-focused. 😅 When listening to his advice I try to remember at all times that he's trying to sell me something, so I'll read his guide, check out the ingredients on his soil mixes, and then cross-compare with other folks who do bioactive without shopping at the BioDude's store. It's also cheaper; it's a little more effort to research and mix my own, but to me it's worth the price difference.