Hitch hiker crab - Id needed

[Scarab138]

Hello every one.

I set up a tank with 90 pounds of live rock, about a month and a half ago. Since then, I have caught glimpses of this guy a few times. Last night I managed to get a photo of it (although, not a great one). I was hoping someone might be able to Id it.

http://www.pbase.com/jay_staples/image/90494418

Thanks,
Jay

 

[Guygettnby]

too hard to id the crab without seeing the front of it. try to get a shot of the claws if you can too. need to see if they are pointed or flat tipped

 

[Scarab138]

I will try to get a better pic. All I have seen him eat, so far, is algae.

Thanks,
Jay