I use something like eco-earth but the last brick I used expanded normally and I let it sit for a bit to dry. For some reason its really loose and my plants are not doing so well. I still mist like I did before and never had problems till now. Im gonna have to change it but thought about something new like Jungle Bed ( anyone ever used it? I used for other herps. Has a mix of play sand, vermiculite, soil, and peat moss. The play sand and vermiculite are the only things that bothered me) or just trying my own mix.