We use tile in our bearded tank...the kind you get at Home Depot real cheap that they just roll off and cut however much you want. We were sure to get some that had good texture so they don't slip on it.
It's MEGA EASY to clean and we don't have to worry about them digesting it.
This is a pic of the environment my son made them with the tile inside
It's 8ft long by 2.5 feet wide and a lil more than 2ft high...
Each one of the lil "rock patterns" is bumped up creating a decent texture for them to walk on and they blend right in like they would on the hard and flat desert sands of their native environment...
