I use orchid bark. Looks really nice in a display enclosure, and so far my humidity levels have been good. My girl's in shed right now, and I only find myself spraying maybe once or twice a day to keep levels between 65-70 (even fluctuates to 75 at times) and I have her in an all glass tank (exo-terra medium-low). Once she's out of shed, I'll probably only be spraying once a day or every other day.