Pom Pom Crab

Lybia edmondsoni

All it takes is one look at a pom pom crab and it’s easy to see where it gets its name from. While it might look like it is holding two cheerleading pom poms they are actually tiny anemones, hence its
other common name, the anemone crab. These anemones aren’t just for show, they are also used to ward off predators. This little crab is no pushover!

The pom pom crab ranges in colour from white to tan. Like many crabs their colour morphs are often an adaptation that allows them to camouflage in their surroundings. Individual specimens may have
contrasting markings on their shells and their legs are often darker in colour, with contrasting bands. The pom pom crab is native to both Indonesia and the waters off Hawaii. It prefers to live among corals in tropical coastal regions. In a home aquarium they appreciate ample rockwork with multiple caves and hiding places. However, once they become accustomed to the tank they will spend much of their time
out in the open looking for food. Its two namesake anemones are separate living creatures that the crab has formed a symbiotic relationship with. If one anemone is lost the crab can even propagate the other
anemone which will grow into a replacement!

The small crabs are among the least aggressive crabs in the hobby and add character to any reef tank. Because of their small size they can easily be housed in a nano tank. They are full of character and
watching them wave their anemones in the water can be hypnotic. They are also an effective cleanup crew member, using their anemones to collect food off of the rock and substrate.

The pom pom crab is classified as an omnivore but its diet generally consists of meaty foods that it mops up using its two anemones. It also will use its anemones to filter zooplankton out of the water column.
If necessary, their diet can also be supplemented with brine shrimp, finely chopped squid or pellets but this is generally not required. In the wild the pom pom crab has been known to substitute sponges or even pieces of coral for its signature anemones. All in all this little crab makes a great addition to a home reef tank. Like many invertebrates they are not tolerant of copper based medications.

You can find our complete clean up clew acclimation guide here