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Emerald Crab

Emerald Crab

Mithraculus sculptus

The Emerald Crab is the go-to solution for bubble algae (Valonia) — one of the few creatures that will reliably eat it. Its bright green coloration and relatively small size make it a useful and attractive addition to reef tanks. Generally reef-safe but large specimens may become opportunistic and pick at corals or small polyps if underfed, so keep well-fed with supplemental algae sheets.

TemperamentSemi-aggressive
Max Size2"
Care LevelEasy
CategoryInvert

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Compatibility Chart for Emerald Crab

See how Emerald Crab gets along with every other species in our database.

Great Match (2)

Yellow Tang Great Both eat algae; no conflict Ocellaris Clownfish Great No interaction

Compatible (81)

Blue Hippo Tang Compatible No known issues between these species Powder Blue Tang Compatible No known issues between these species Kole Tang Compatible No known issues between these species Naso Tang Compatible No known issues between these species True Percula Clownfish Compatible No known issues between these species Maroon Clownfish Compatible No known issues between these species Clarkii Clownfish Compatible No known issues between these species Flame Angelfish Compatible No known issues between these species Coral Beauty Angelfish Compatible No known issues between these species Emperor Angelfish Compatible No known issues between these species French Angelfish Compatible No known issues between these species Six Line Wrasse Compatible No known issues between these species Fairy Wrasse Compatible No known issues between these species Melanurus Wrasse Compatible No known issues between these species Cleaner Wrasse Compatible No known issues between these species Yellowspotted Wrasse Compatible No known issues between these species Clown Goby Compatible No known issues between these species Firefish Goby Compatible No known issues between these species Yellow Watchman Goby Compatible No known issues between these species Mandarin Dragonet Compatible No known issues between these species Blue Devil Damselfish Compatible No known issues between these species Green Chromis Compatible No known issues between these species Yellowtail Damselfish Compatible No known issues between these species Copperband Butterflyfish Compatible No known issues between these species Raccoon Butterflyfish Compatible No known issues between these species Longnose Butterflyfish Compatible No known issues between these species Flame Hawkfish Compatible No known issues between these species Longnose Hawkfish Compatible No known issues between these species Midas Blenny Compatible No known issues between these species Tailspot Blenny Compatible No known issues between these species Lawnmower Blenny Compatible No known issues between these species Bicolor Blenny Compatible No known issues between these species Royal Gramma Compatible No known issues between these species Banggai Cardinalfish Compatible No known issues between these species Pajama Cardinalfish Compatible No known issues between these species Purple Tang Compatible No known issues between these species Scopas Tang Compatible No known issues between these species Achilles Tang Compatible No known issues between these species Clown Tang Compatible No known issues between these species Sohal Tang Compatible No known issues between these species Convict Tang Compatible No known issues between these species Tomini Tang Compatible No known issues between these species Horn Shark Compatible No known issues between these species Foxface Rabbitfish Compatible No known issues between these species Magnificent Foxface Compatible No known issues between these species One Spot Foxface Compatible No known issues between these species Masked Rabbitfish Compatible No known issues between these species Niger Triggerfish Compatible No known issues between these species Bluechin Triggerfish Compatible No known issues between these species Undulate Triggerfish Compatible No known issues between these species Pinktail Triggerfish Compatible No known issues between these species Bubble Tip Anemone Compatible No known issues between these species Magnificent Anemone Compatible No known issues between these species Long Tentacle Anemone Compatible No known issues between these species Carpet Anemone Compatible No known issues between these species Sebae Anemone Compatible No known issues between these species Chicago Sunburst BTA Compatible No known issues between these species Rose Bubble Tip Anemone Compatible No known issues between these species Rainbow Bubble Tip Anemone Compatible No known issues between these species Colorado Sunburst BTA Compatible No known issues between these species Skunk Cleaner Shrimp Compatible No known issues between these species Fire Shrimp Compatible No known issues between these species Peppermint Shrimp Compatible No known issues between these species Tiger Pistol Shrimp Compatible No known issues between these species Sexy Shrimp Compatible No known issues between these species Nassarius Snail Compatible No known issues between these species Tuxedo Urchin Compatible No known issues between these species Red Fromia Starfish Compatible No known issues between these species Hammer Coral Compatible No known issues between these species Torch Coral Compatible No known issues between these species Frogspawn Coral Compatible No known issues between these species Mushroom Coral Compatible No known issues between these species Rhodactis Mushroom Compatible No known issues between these species Ricordea Florida Compatible No known issues between these species Ricordea Yuma Compatible No known issues between these species Bounce Mushroom Compatible No known issues between these species Green Star Polyps Compatible No known issues between these species Pulsing Xenia Compatible No known issues between these species Montipora Compatible No known issues between these species Leather Coral Compatible No known issues between these species Duncan Coral Compatible No known issues between these species

Somewhat Compatible (4)

Blue Leg Hermit Crab Somewhat Compatible Emerald may attack small hermits Turbo Snail Somewhat Compatible Crab may attack snail for its shell Zoanthids Somewhat Compatible May eat zoa polyps if underfed Acropora Somewhat Compatible Large emerald crabs may pick at SPS when hungry

Not Compatible (5)

Brownbanded Bamboo Shark Not Compatible Shark will eat crabs Epaulette Shark Not Compatible Will eat crabs Coral Catshark Not Compatible Will eat crabs Picasso Triggerfish Not Compatible Trigger will crack and eat crab Clown Triggerfish Not Compatible Trigger eats all crustaceans

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