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Emerald crab. All Mithras crabs have hairlike filaments on their legs. Btw emeralds eventually become nuisances!! I have a giant one in my sump that started eating my acropora.
I have like 10 emeralds they blend in so well 1/2 the time I can't find them ,
but biggest nuisance in my tank isn't the crabs It's my purple lobster he eats all my hermits and snails .