Try googling "Eunicid". Might be what you have, or at least you could describe how it's not like a Eunicid...? There are many different species of Eunicid though...you may not find your exact one.
Hehe - thats what I was wondering if it is... Your post will probably yield better results though, haha.
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No more tanks - Laying off the ReefCrack for awhile!
Cheers,
Chris