Bad crab???

It's hard to tell ... is it this?

http://www.liveaquaria.com/product/prod_display.cfm?c=497+501+625&pcatid=625

Pictured is quite pretty. Any that I've had were usually brown or tan and brown. I personally thought they were pretty aggressive *acting* and chasing. Never saw them kill anything, but always gave away once they really got bigger.

Doesn't look like any gorilla crab or hairy crab which will prey on small fish. His pincher look really *round* and harmless. Again, it's hard to tell from picture.
 
Definatly not anything on that page. Found him hiding in a rock. Daughter said looked like he tried to crab a fish as it went buy. Ive had 3 gobbies come up missing. Wondering if he is guilty
 
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