Bobbit worm?

[Lilbitreefer]

So I could not figure out how my mushrooms were moving long distance across the tank. Then the other day I saw this think peaking out from the mushrooms. It hides really quick and seems to have made a home under the rocks. It has 5 antennae that are stripped white and read. It is really fast. I would like to keep it but I do not want my fish to disappear. It seems I have already has 2-3 disappear a couple months ago. So I think this might be the culprit.

 

[SeaCucumberFan]

5 antennae you say?
You got a bobbit there, my friend!
Get rid of him you shall.

 

[Sugar Magnolia]

Yep, Eunice worm. Good thing you found it and got it out. http://www.advancedaquarist.com/blog/if-you-thought-big-bristleworms-were-scary

 

[eastlake]

Put it in a separate tank if you want to keep it. It will continue to eat coral and will move onto your fish once it has eaten everything else, including any and all inverts. They are remorseless eating machines.