Hey Guys, For a substrate, i use repti Bark. It is from the company Zoo Med. It is 100% pure fir bark. It is excellent for holding in moisture for the humidity that is needed in the tank for snakes. But it does not stay 'wet'. Cleo Loves it, she digs and hides under it all the time. And it makes her tank look really awesome. As soon as I get a scanner i will post a pic of her in her tank . I was told that sand is really bad for the snake, and everyone else here has confirmed that. Good Luck.