The emerald crab is named after its colorful yet distinct appearance. The overall body color is shiny emerald green. It is a few inches in diameter (1.5-2inches) and has hairy legs punctuated with powerful claws. The body is almost flat. A quick glance would give one the impression that it is bubble algae. On the contrary, the latter is a favorite delicacy of the emerald crab.
Because Emerald Crabs have been known to eat reef polyps if they get hungry enough, keeping an eye on your crabs to ensure they are adequately nourished might save you many future problems.
The legs and claws are linked to the carapace, which is long, flat, and shiny. Like other crabs, this one has four pairs of hairy legs, two long and spoon-shaped claws, and white markings on the tips of its feet, just like the others.
Live rock is also a favorite of these little guys, so be sure to give them some to use to make small tunnels to hide in during their molting process. Even if your tank has live rock, it’s conceivable that the current tank inhabitants have already claimed all of the unique hiding spots.
An emerald crab’s typical lifespan varies between two and four years, depending on the species. They may not be the world’s longest-living invertebrates, but they can outlast the vast majority of low-cost cleaner shrimp.
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