Mystery Tag-along Crab... Help!

aquariumlover1

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When I purchased my live rock, I noticed that I had a tag-along crab, about a half inch to an inch. I've left him in the tank for a while, and now I'm getting just a bit concerned. He's dull in color, but I've been examining him and I've noticed black tips on the claws. Also had a peppermint shrimp go missing recently-- could he be a culprit (not to mention a Rainsford goby, won't blame the crab given the possibility of starvation). Anyway, he comes out at night, and when there's food in the tank, primarily. Lives in a little burrow. At first he reminded me of an Emerald, but I'm verifying that he's not something harmful. Can't get over that peppermint, those black claws, and his appetite. No picture, sorry, but any help I could get would be appreciated!
 

PHP

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Is it possibly that he looks "hairy"?

What comes to mind when you say black tips is a Hairy Crab (Bad for your tank). Most of the hairy crab species are bad and opportunistic feeders (other than mithrax which have a smooth body, hairy legs, and "scoop" shaped claws).
 

Stang Man

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From your profile the tank is still very new it could be a number of things, can you give more detail of the crab and the tank as well? 3 + month's is not a safe area of a new tank to be for certain stock.
 

pirahnah3

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hmmm without a pic and or size of it heres a few choices

My main guess would be: Gorilla Crab



But heres a few other known crab species with black tipped claws.

Black fingered mud crab (mainy only found in the chesapeak bay area thou)



Stone Crab or a Rock crab



Brown Crab


This species of crab is easily identified by its large black-tipped toothed pincers and characteristic ‘pie-crust’ edging. The heavy oval-shaped body is reddish-brown in color
 

kloseo

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my guess without pics is a mirthax crab, very similar to emerald crabs. they are scavengers and are often hitchhikers on live rock, they are fine in your tank
 

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