ProRep Bark Chips are used for all species that require a humid environment. Amphibians, forest or jungle living reptiles and invertebrates all thrive on this safe 100% natural product. Directions: Spread the substrate evenly over the bottom of the enclosure to a depth of at least 2 (5cm). Bark Chips can be moistened to provide extra humidity but avoid making them too wet or waterlogged. Spot-clean daily and completely replace every two or three weeks, or more frequently if it becomes heavily soiled. If you are using an under-tank heatmat as your heat source do not use a thick layer of Bark Chips as this may cause the heatmat to overheat. Please refer to the heatmat manufacturers instructions for more information.