Emerald Crab

Emerald Crab

Mithrax sculptus


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Care Facts

Care Level: Easy
Temperament: Peaceful
Diet: Omnivore
Reef Safe: Yes
Minimum Tank Size: 15 Gallons
Max Size: 2 inches
The Emerald Crab, Mithrax sculptus, are one of the most popular marine crab species for the home aquarium. They thrive in tanks with plenty of live rock and a sandy substrate as the like to graze searching for algae. As voracious algae-eaters, they can be incredibly beneficial members of a cleanup crew. If there is not enough algae or seaweed, they can be supplementally fed with prepared meaty foods. They should, however, be fed regularly to keep them from becoming aggressive towards their tank mates. Emerald Crabs are particularly effective against bubble algae. There is a reason emerald crabs are so popular; they are very easy to care for, require almost no attention, and are effective in in controlling pesky algal blooms hence keeping the tank clean. 

Emerald crabs are always cool! Lost mine to high nitrates last time but replacing my clean up crew, he was first on the list! Fun to watch eat fun to watch grow.


Reviewed by: Jeff Cergnul on Sept. 4, 2017

These crabs appear very busy picking at the rocks and sand. They seems to be good cleaners. They leave my fish and invertebrates alone. Good addition to the tank!


Reviewed by: Brian Bale on March 24, 2017

Very nice little crab. Fun to watch. He has already molted twice since being added, went from a brownish color now turning green.


Reviewed by: Ray on March 19, 2017

Emerald crabs I love my emerald crabs. I have 5 and can always see at least 3 at a time working on my live rock. They are fun to watch, actually it's relaxing! They are out and about and very enjoyable!


Reviewed by: Linda Steele on March 13, 2017

A lot bigger than I was expecting!


Reviewed by: Shannon on Jan. 23, 2017

I received one as part of a reef pack. While it is usually hiding most of the time, it makes appearances once my tank moves to moonlight LED. I have a feeling he is nibbling on the edges of my mushrooms as the other inhabitants are completely reef safe. Arrived happy and healthy.


Reviewed by: Lee Reynolds on Sept. 25, 2016

Came in good condition. Adding rocks to the tank changed water condition, but they survived.


Reviewed by: Michael Joseph on June 14, 2016

Excellent addition to my tank


Reviewed by: Teresa on April 22, 2016

Very healthy very cool


Reviewed by: Kevin Stuart on March 26, 2016

Very fun to watch. I ordered two for different tanks. One was a very light color while the other was very green. The cleanup crew has been doing great at making my tanks look better


Reviewed by: Tazdad08 on March 22, 2016

I received a very healthy, nice size Emerald. He's very active and of course very funny. Love this web site!


Reviewed by: Linda on May 15, 2015

Very interesting addition to a reef clean up crew. Likes to quickly hide in crevices.


Reviewed by: Lia Debettencourt on Nov. 27, 2014

Another family favorite to watch them nibble on their food and climb throughout the tack. Very nimble! They walk around like little boxers and walk sideways in the sand. Doing a great job housekeeping.


Reviewed by: James Fullard on Aug. 23, 2014

Currently Emerald Crab does not have any questions and answers.

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