What kind of worm?

Mikek

Reefing newb
Smack dab in the center of the pic...Is this a gray bristle, or something else? and is it friendly or harmful?

Thanks
 

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Thanks, so far I have been of the harmless school of thinking. Up till now I had only seen red ones, so I wasn't sure. :)
 
+1 Kyle

I've had a bunch of these guys in my tank for about a year now. Never had any problems. Just carefull not to touch them with bare skin. They sting.
 
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