The Saltwater Emerald Crab is a great addition to any aquarium and is reef safe. They eat bubble algae and are very easy to take care of. Ample food needs to be present for them though as they will clean all the bubble algae out of the aquarium, an then be hungry. Supplementing seaweed or chopped meaty food will suffice for them. They are also scavengers and will clean out most organic debris from the aquarium.