Mystery crab

I inherited this crab in a set-up I bought. I was told it was reef-safe but it seems quite predatory and now my Citrus Goby has gone AWOL. Does anyone have any ideas about its identity. And whether it is actually reef safe? It's not as big as it looks in the picture. The claws are probably two inches long when full extended.

 

is it pointed pincers not reef safe? rounded ones okay? they look pointy

 

They look pointed to me... Its mouth seems very small so I can't see how it could devour a fish. It's never appeared quick enough to catch anything else in the tank. But the Goby was quite a timid thing and I haven't seen him for three days. I've just had a look in the weir in case he'd done a jump but no sign - so I can only deduce it's the crab... In which case, he's sump-bound...

 

Can use him for food too lol

 

it might be part of the anomuran family of crabs. while they say theyre reef safe, thats in regards to corals mostly. doesnt mean theyre safe for other inverts and fish.

 

It hangs around with a cleaner shrimp and it's never troubled it...

 

ive been trying to find a positive id, but no luck yet. sorry.

 

Ok, Divott. Thanks a lot. I'm loathe to get rid of it - but my LFS say they'll give it a home. It's just the Citrus Goby was my seven-year-old son 's favourite fish so I'm in a dilemma whether I should tell him the truth or just go out and buy a new one...