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Trapezia Pocillopora/Acropora Crab
(Trapezia sp.)
Trapezia Pocillopora/Acropora Crab
Please Note: Due to variations within species, your item may not look identical to the image provided. Approximate size range may also vary between individual specimen.
Additional locales and sizes may be available!

Quick Stats

Care Level Easy
Temperament Peaceful
Color Form Assorted
Diet Carnivore
Reef Compatible Yes
Water Conditions dKH 8-12, pH 8.1-8.4, 72-82° F
Max. Size 1"
Origin Indonesia, Maldives
Family Crustacea
Supplements Calcium, Magnesium, Iodine, Trace Elements
Minimum Tank Size 30 gallons
Compatibility View Chart
What do these Quick Stats mean? Click here


The Trapezia Pocillopora/Acropora Crab, or Acro Crab for short, is a small commensal crustacean which lives its whole life within the branches of Pocillopora corals and Acropora Corals if no Pocilloporid corals are available, aiding in the proper water flow between the branches to keep these areas clean. In a symbiotic relationship with its host coral, the Trapezia Pocillopora/Acropora Crab is thought to feed on particulates trapped by the coral polyps, fallen detritus, and the coral's secreted mucus. In turn, the crabs guard the coral from invaders and fend off predators.

The importance of the Trapezia Pocillopora/Acropora Crab's role within a larger reef ecosystem is just now being recognized. Previously considered by hobbyists to be a coral "pest," the Trapezia Pocillopora/Acropora Crab may actually improve your success with SPS husbandry. Since the crabs constantly clean and defend their hosts, corals hosting Trapezia sp. have higher survival rates and stronger growth.

In the home aquarium, they may eat excess meaty food particles that lands on the coral, but won't need to be provided a staple diet. As an obligatory commensal coral crab, though, they will require a host for survival.

Like other invertebrates, the Trapezia Pocillopora/Acropora Crab cannot tolerate high nitrate levels or copper-based medications.

Approximate Purchase Size: Small: 1/2" to 3/4"; Medium: 3/4" or larger.

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