I think Female emeralds have smaller claws than males. Hard to ID without better pics. I had an unknown that came on liverock years ago and was a great freeby untill zoas began to diappear.
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Red Sea Reefer 525 XL, Vortec M1, Reef Octopus 150 SSS Elite, Apex, WAV power heads, 3 X Aqua Illumination 26 HD. 
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