wow thats impressive. does it have any wiskery type things on its head if it does its probably a eunicid worm they can get up to seven feet in length. kinda weird color for a bristle worm.
There is a website where a person had a 6' one in his reef (accidently brought in on live rock.) Here is the web address: http://www.oregonreef.com/sub_worm.htm
if possible i would get another tank for it and experiment to find out what it is what it does and how big it really gets. Thats what i would do if i found anything over a foot long in my tank that i didn't put there. At the least you could be like "Look at this thing i found" after showing off your display.
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