Crab in live rock - good or bad?

MERKEY

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Emerald crab...good CUC but will snack on softies and LPS. I had to move mine.
 

Dr. Dendrostein

Marine fish monthly
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Got some live rock for my refugium and this guy dropped out when I was moving it. Type? Good? Bad?? What do I do with him?
9C9EA459-6829-433B-81B1-F50911F1F047.jpeg
Recently had on from live rock, other lived in center of a soft coral, never seen that. The one in coral, looks white and like the Abominable Snowman on steroids. Abominable Snowman in a separate chamber in sump, so ok. Other in DT. No issues
 

DSC reef

Coral wasted
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It's a crab so any can be opportunistic feeders. Plenty of threads where members witnessed emerald cards eating flesy coral. Use caution.
 
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