I'm keeping Baird's rat snakes, due to them being hatchlings it's important to keep humidity a bit higher than you'd think just to make sure they don't get dehydrated. I also keep my snakes in screen tops and one thing I've started to do is keeping a pile of misted moist shredded coconut husk bedding in there. Humidity is held up a bit more consistently. The substrate doesn't get moldy when wet and the snakes love burrowing in it.