Gorilla crab?

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Hello all! I caught two small hitchhiker crabs in my new pink birdsnest coral. One looks like a gorilla crab and the other, I think, might be an 'acro crab' (the one's that usually hang out in corals). Can anyone give a positive ID please?

 

[lakshwadeep]

Keep the small one!!!!! It definitely looks like one of the trapezia crabs that are extremely beneficial to SPS like acropora:

http://news.mongabay.com/2006/1023-ucsb.html

 

I'm less sure about the hairy one. I've seen some people state that they are harmless and others claim they were predators.

 

This is a good site for identifying hitchhikers:

http://www.chucksaddiction.com/hitchcrabs.html

 

Unfortunately, chuck's addiction seems have exceeded its bandwith, but the basic format is a list of many pictures.

[Zombo]

Hello all! I caught two small hitchhiker crabs in my new pink birdsnest coral. One looks like a gorilla crab and the other, I think, might be an 'acro crab' (the one's that usually hang out in corals). Can anyone give a positive ID please?

 

 

Kinda tough to tell for certain, but looks like a gorilla crab (larger hairy beast) and a small porcelain crab (good).

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Thank's guys. I just came to describe a little more about the crabs when I saw your replies. Ok, so the small one's going to stay then.

The hairy crab in the other hand doesn't look too friendly. He has green eyes. The right claw is larger than the left (left claw is like a normal leg). I guess I should get rid of him; better safe than sorry.

[lakshwadeep]

If you have a fuge, you could put the hairy crab there. Also, porcelain crabs are not the same as trapeziids.

 

The hairy crab may look like this:

http://reef.eldersign.org/?p=237

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I put the little one back in the tank and I'll ban the hairy one to the fuge. Thank you all for your help!