Yes, it is definitely not a jawfish.
Its a Stonogobiops Nematodes prawn goby. They are very nervous and wimpy fish. I think they feel most comfortable when there's a symbiotic shrimp around.
http://www.canreef.com/phpBB2/viewto...=116520#116520
Pet Gallery has several goby/shrimp pairs at this time:
http://www.canreef.com/phpBB2/viewto...ight=nematodes