Do watchman gobies eat crabs?
 

Picked up a pom pom crab a few days ago. Dropped him into the tank on a rock.

5 mins later he is gone and my orange spotted diamond sand sifting goby is sitting next to where he was. Haven't seen the carb since.

http://1.bp.blogspot.com/_jhW52aMy8U...Boxer+Crab.jpg

http://www.aquacon.com/images/DiamondWatchman.jpg