Ghost Crabs. Common Shore Crab (Carcinus maenas) – One of the most common crabs in British waters, it can be found in most marine habitats and has become an invasive species in many parts of the world. It should also have a lid that fits tightly to stop the crabs from getting out. You can also use coconut fibre substrate, or use a combination of this with some clean play sand. Crabs live in water but also want to be set out of water for some time, you can provide them with a similar shore kind of area in the tank. They are able to spend most of their time above the reach of the sea because they have a water-tight external skeleton that prevents water loss from their tissues and keeps them from drying out. O. quadratus, the beach crabs noted for their running speed, occur on dry sand above the high-tide mark on the western Atlantic coast from New Jersey to Brazil. They are fun to watch as they dart around and dig their burrows in the sand.

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