Crabs spend most of their lives underwater and live in depths of saltwater that range from shallow reefs and shorelines to deep sea bottoms, rarely leaving the water for land. As pets, several marine species of hermit crabs are common in the marine aquarium trade. They are commonly kept in reef fish tanks. They breathe through gills but don't have to carry around their water to do so, and most can survive briefly out of water as long as their gills are damp. However, this ability is not as developed as it is in land hermit crabs. A few species do not use a "mobile home" and inhabit immobile structures left by polychaete worms, vermetid gastropods, corals, and sponges.
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