headed

I'm getting a woma hatchy, originally was going to get a black headed python but have since decided on the woma. Got the click clack ready to go, just waiting for a few things to arrive in the post to complete it. Once hes out of the click clack, he will be put in the appropriate size vivarium...

I am looking for the best substrate I should put in a black headed python enclosure? Some breeder said to use shredded paper, but I have heard that isn't the best nor the safest to use (no idea why though?). Also what would the best substrate be for a click clack set up? I was going to use...