Emerald Crab - Mithraculus sculptus
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The Emerald Crab (Mithraculus sculptus) is a hardy and vibrant marine invertebrate, prized for its striking green coloration and algae-grazing behavior. This peaceful crab is an excellent addition to reef aquariums, helping control nuisance algae while adding activity to rockwork and crevices.
Common Name: Emerald Crab
Scientific Name: Mithraculus sculptus
Family: Mithracidae
Size: Up to 2 inches (5 cm)
Temperament: Peaceful
Difficulty: Easy
Reef Safe: Yes
Native Region: Found throughout the Caribbean and Western Atlantic, commonly inhabiting coral reefs and rocky substrates with abundant algae.
Tank Size: Minimum of 20 gallons
Temperature: 74–80°F (23–27°C)
pH: 8.0–8.4
Salinity: 1.023–1.025
Substrate: Live rock with plenty of crevices and algae-covered surfaces.
• Algae Control: Actively grazes on hair and bubble algae, helping maintain clean rock surfaces.
• Behavior: Peaceful but may occasionally pick at small soft corals or sessile invertebrates—monitor in reef tanks.
• Diet: Omnivorous—accepts algae, detritus, and small meaty foods.
• Tankmates: Compatible with most reef fish and invertebrates; avoid aggressive species that may threaten the crab.