Giant worm! What is this?

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Ignorant newb here but I saw something similar in my tank recently and concluded it was some sort of larval form of a bristleworm, apparently they can break off a part of themselves and it turns into that or something? But not as big. Haven't seen it since, but it definitely freaked us out too.
 
Will need a good picture of the head. Can you put it in a container with some tank water?
Agree!
ribbonworm8.jpg

Nemertea sp.?
 
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WHAT KIND OF HAPPY ACCIDENT(S) HAVE YOU HAD IN YOUR REEF?

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