They seem to clean well as they are always picking at the rocks, and I have watched them eat diatom off the substrate. This is one crab that I have mixed feelings on. Like other invertebrates, the Emerald Mithrax does not tolerate copper-based medications or fluctuating water parameters. However when well fed, most Emerald Mithrax Crabs are very tolerant of their tankmates and highly compatible in reef environments. Otherwise, this opportunistic feeder may turn to corals, invertebrates, or small fish for a food source. Many aquarists supplement the Emerald Mithrax Crab's diet with dried seaweed and chopped meaty foods, such as shrimp, as well as a quality pellet fish food. Once familiar with its surroundings, the Emerald Mithrax Crab will venture out of hiding during the day to forage on algae.Ĭare needs to be taken to ensure an ample supply of food is available for the Emerald Mithrax Crab. In the home aquarium, this member of the Majidae family requires a well-established aquarium with plenty of rockwork and hiding places. Native to the reefs of the Caribbean, the Emerald Mithrax Crab is nocturnal and hides in caves and amongst rubble during the day. Its distinct, flat shiny green body and hairy legs easily identify the Emerald Mithrax Crab. Unlike many other animals, Mithrax sculptus will eat bubble algae and helps clean your aquarium of these algae. It will enthusiastically feed on uneaten meaty foods and many types of nuisance algae. The Emerald Mithrax Crab is well respected for its scavenging ability. I may end up adding more down the road, as they are such good cleaners in my opinion. Many people find that they don't touch their corals and work just fine. I ended up returning one of mine to the local fish store (LFS) when I saw him pulling off some zoanthids. Emerald Crabs can be hit or miss when finding one that will nip at your corals. It pulled all the filamentous dead junk off the rock, and cleaned down in nooks and crannies. Mine is at constant work, always picking at the rock and keeping things cleaned up. The Emerald crabs are great cleaners, and hard workers. I am including many crabs below, but from what I have seen, the most commonly used and readily found, are the Emerald Crab, the Blue or Red Leg Hermits, the Zebra hermit, and the Scarlet Reef hermits. I think that they just need to be monitored to see what kind of behavior they exhibit. You may have to test the waters and see how yours reacts.
Some crabs of the same species will act differently, as far as aggression, or nipping at corals. You may have to experiment with them, and form your own opinions. Some people will say they are the devil's spawn, while others will say they are great and have had no problems, and you will find some online 'packages' that consist mostly of (hermit) crabs. I should start by saying that I, as well as others on the message boards, have mixed feeling on crabs.
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