About This Our Natural 2-3 inch Sea Sponges are an essential element of any hermit crab habitat - without sea sponges in their habitat, they will eventually drown while drinking water. They provide an ideal way for hermit crabs to properly drink and exit their water dishes while providing Humidity 4 per pack All natural sustainably harvested and ecologically friendly. Our sea sponges have natural minerals from the ocean that will help your hermit crab thrive. Over time, they will consume the sponges, which is highly beneficial for their exoskeletons Place in your hermit’s water dish, it should be changed out for a clean dry sponge regularly to prevent containment's. You can microwave the sponge for 10-15 seconds to sterilize. Directions: Place sponge in your crab's water dish (the sponge should take up most of the dish area). Jumbo hermit Sponge size 2-3 inch