I've been looking a lot lately into building vivariums for a colony of poison dart drogs. I am absolutely obsessed with it! But if you want some GREAT info on vivarium building, check out www.blackjungle.com. They have really nice step-by-step instructions with pictures of each step of the process including laying the Terralite bedding, the base soil substrate, planting live plants, both terrestrial and epiphytes, and even waterscapes. That's one thing you'll definitely want to look into. Mountain Horned Dragons won't drink unless there's a running water source.

They're definitely gorgeous lizards, good luck with him!