Common name: Variable Coral Crab

General information

The Convex Reef Crab, Carpilius convexus, is a colorful and active invertebrate that can add both diversity and a touch of drama to a reef aquarium. Known for its distinctive convex carapace and vibrant coloration, which can range from orange to red with white spots, this crab is a nocturnal scavenger that can help keep the tank clean by consuming detritus and uneaten food.

Care

Carpilius convexus requires a tank with plenty of live rock and hiding places to mimic its natural habitat. It is important to note that while they are generally reef-safe, they may prey on small, slow-moving fish or invertebrates. Therefore, tank mates should be chosen with care. Regular feeding with a varied diet including meaty foods and plant matter is recommended to keep them from becoming opportunistic feeders on tank inhabitants.

Reproduction

In the wild, Convex Reef Crabs are known to reproduce by releasing larvae into the water column. In captivity, breeding is less common, but with optimal conditions, it is possible to observe larval stages in the aquarium.

Habitat

Carpilius convexus is found in the Indo-Pacific region, from the Red Sea to Hawaii, and from Japan to Australia. They inhabit coral reefs and rocky substrates, often hiding during the day and emerging at night to feed.