UNBLEACHED ADDITIVE FREE Safe for you Hermit Crab. Our 1 - 2 " Natural Sea Sponges are an essential key element of any hermit crab habitat, without the sea sponge in their water dish they may drown. They provide an ideal way for hermit crabs to properly drink and exit their water dishes. All Awesome Aquatic sponges are sustainably harvested and ecologically friendly. No additive, but thoroughly cleaned and ready for use. They provide minerals and nutrients from the ocean that will help your hermit crab thrive. Over time, they will consume the sponges, which is highly beneficial for their exoskeletons. Awesome Aquatic’s Unbleached Regular (with Natural brown and tan colors), and there Natural Regular and Jumbo hermit sponges are hand selected and pass inspection before packaging. Only High Quality sponges are used. Directions; Place 1 or more sponges in your hermit’s water dish, to fill the dish. They should be changed out for a clean dry sponge regularly to prevent contamination or fouling. You can microwave the sponge for 10-15 seconds to sterilize. Our 1 - 2" UnBleached Natural sea sponges are a key element to all hermit crab enclosures. They prevent drowning and provide humidity. They also contain Calcium that the crab will ingest over time to help strengthen their hard-outer exoskeleton shell that they shed. Our all natural sustainably harvested and ecologically friendly sponges are a great addition to any hermit crab enclosure. To use Place in your hermit’s water dish, it should be changed out for a clean dry sponge regularly to prevent containments. You can microwave the sponge for 10-15 seconds to sterilize.