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Emerald Crab

Species photo: Mark Loch, CC BY-SA 2.0, via Wikimedia Commons

Invertebrates · Crabs

Emerald Crab

Mithraculus sculptus

$14.99

A green algae crab known for eating bubble algae.

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From our species guide

Care at a glance

  • Care levelEasy
  • Reef safeYes
  • TemperamentSemi-aggressivePeaceful if fed; hunger drives it to eat snails, polyps
  • Temperature72–80 °F
  • Salinity1.023–1.025 SG
  • pH8.1–8.4
  • Min tank20 gallons
  • Favorite foods
    1. Bubble algae
    2. Hair algae / film algae
    3. Pellets / mysis / nori
  • Max size2 in (5.1 cm)

In plain words: The Emerald Crab is a small crab that is shiny green, like a jewel. Its back is flat, its legs are a bit hairy, and its claws look like tiny spoons with white tips.

Full species guide → See its family tree

About the Emerald Crab

Emerald crabs pick at nuisance algae, especially Valonia bubble algae. They are generally reef safe, but larger crabs may get opportunistic if underfed, so keep algae or supplemental food available.