Emerald Crabs are excellent herbivores and scavangers. They are a valuable addition to any reef clean up crew. 

Mithraculus sculptus, commonly known as the green porcelain crab or emerald crab, is a small species of crab belonging to the family Mithracidae. It is primarily found in the tropical waters of the Caribbean Sea and the Gulf of Mexico.

These crabs are excellent herbivores, feeding on algae and detritus. They are generally peaceful crabs and can be kept in reef aquariums, where they help control nuisance algae.

Emerald crabs are a popular choice for marine aquarium enthusiasts due to its role in a clean up crew within the tank. They are relatively hardy and can adapt to a range of water conditions.