Crab ID!

[tyler1503]

Could someone please help with an ID?
That's an Aussie 20c coin measuring an inch in diameter.
I collected some rock locally and he and a few others of the same species came in on the rock. I want to put him in my reef tank, but not without knowing what he is first!
Thanks

 

[classklown90]

I wouldn't risk it

 

[Reefing Madness]

Tough to tell, ya gotta get a pic of his claws. The nasty ones usually have pointed tip claws.
But from the looks from the back, he looks like a Xanthid type crab, which isn't a good thing.
Crab Hitch Hikers