Crab id please

Better picture towards the bottom of page.
He never shows his face during the day, he is all white with hairy legs.
Thanks!

 
I have no crabs in the tank, this one came in with some LR. I can't get a better picture of him he never comes out when the lights are on
At night he always crawls half out of a hole to eat some coralline.
 
When I first saw him about 2 months ago he was the size of a pencil eraser, now he is about the size of a nickel.
He has always been white in color
 
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