I keep them on a thin-layer of fine-washed play sand. Humid hide with peat-moss/sand mix on cool end. Inverted plant saucers (one on warm end, one on cool end) for hides. Hot spot provided on warm end between 90-95*F. Spray lightly 2-3 times a week on the cool end of the cage. Plenty of ventilation. Pretty easy geckos to keep...