|Common Name||Emerald crab, green clinging crab.|
The Emerald crab is nocturnal and hides most of the day in caves in reef rocks. But sometimes is active during the day.
The Emerald crab is said to be "reef safe", but is known for it's ability to kill and consume smaller animals that live with it in the tank. It is very common in fish tanks, and most aquariums have them. Because they are known to eat bubble algae and clean the tank.