Still dont have a name yet- still thinking..or waiting to have him tell me what his name is. :lol: And the substrate is a reptile sand like stuff, not repti sand or calci sand..cant remember the name of the stuff right now. I use the same stuff for my AFT Gecko too, I like it, makes it easier to keep clean, and has never caused a problem. I talked to a breeder about the stuff, cause I was unsure about it, he uses this stuff too. But, if I can find something better..other than aspen or the like, I would switch...I am allergic to the pine and aspen anyhow... and I kinda want to stick to a natural looking sub., and Savs dig alot too, so it satisfies his digging. Any ideas?