ID help - worm with pic 40x magnification!

[ihavecrabz]

Red to the naked eye. Original thought was bristle worm but not sure once I saw it under the microscope.

 

[BlueRoofTang]

Eunice worm, maybe?

 

[Dkuhlmann]

Yep that is a Bobbit Worm. Kill it :hammer: Unless of course you want to give it a dedicated tank. They will eat anything alive in your tank and they get HUGE. Do a Google search for Bobbit Worm and see the story about one that was something like 9' and nobody saw it until they started losing corals. There are pictures of it. One wicked looking creature.