I read on a care sheet everything needed to know about Crested geckos and how to care for them, and it was pretty darn helpful. However, they didn't list what substrates are suitable for this species or the humidity level they need. The only thing it said about the humidity level is to mist twice a day, which isn't that helpful to me because I may need to mist more than twice a day since I live in a hot & dry climate/environment.