I use Eco Earth for all my reptiles. I think it is the best. It's all natural so it won't harm the animal if swallowed. That's why I use it. Hope that helps : )
I'm a big fan of slate and\or tile floors for most of my critters. My leos are on tile + slate but their humid hide is eco earth. They often end up eating some when they catch a dubia or super that I put in there for them and they've had no issues.