Help on ID of crab?!

Ok so recently i noticed a small crab in my nano tank & i didnt really think much of it till today. He has grown quite a bit since the last time I've seen him & not only that but I found a dead blue crab in there which I believe he was the culprit to killing. My best guess is that this crab should probably be fed to my puffer so I tore the rocks down in my nano & caught him. I have him in a breeder at the moment till you guys tell me otherwise on if he is good or bad but my best guess is that he is not safe for my nano tank which contains blue leg crabs, some corals, a yellow goby & a red scooter blenny. So here are the pics and you guys can be the judge.

P.s. sorry if the pics are the best...i took them with my camera phone cause I was in a hurry to get to work...if u need more pics for help I'll try to take some. Thanks!

 

Sorry, hard to say by those pictures.

Try here:

Crab Hitch Hikers

 

who cares - if you didnt put it there, throw it down the toilet

 

general guideline is

rounded claws - OK
sharp claws - the big white telephone as per Phoenixheights suggestion

Steve

 

Well he could feed it to his puffer... its an odd looking crab.

 

Wow! didn't know about this site (link you provided). Awesome info!!! +k

 

alright thanks...i'll take a look at the website and hopefully make a good decision. the crab isnt very colorful obviously by the pictures the color is quite dull. I just wanted it out of my nano tank asap before it decided to chow down on some more blue leg crabs or my corals next