Emerald Crab

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Emerald Crab
Critter Category: 
Crabs

To reduce the problem of Valonia (bubble algae), many people recommend the Emerald Crab as the solution. They are known to pick these off the rocks and consume them. I've added them to my reef often, and results vary. I've seen them consume bubble algae, as well as decimate a troublesome spot of Caulerpa. Reports vary with these crabs, sometimes good and sometimes bad. Reef safe, usually.