Notes: The Emerald Crab is a superb algae eater, and will even eat bubble algae. It is very useful in keeping reef aquariums clean and free of undesirable algae. Large specimens can be harmful to small fish although this is unlikely, especially if there is sufficient algae for the crab to eat.

If there is not sufficient algae growth you can supplement the Emerald Crab’s diet with herbivore and meaty foods as well as macro algae.