worm id please (pics)

[lafarrow]

I came across this as a tiny guy and in two weeks Holy cripes did it embiggen! I searched all over the inter webs and it looks to be a worm but most pics come back to reefers asking what is it and then no answer. It is tube like, appears to have variegated segments, a feeding end with tentacles and moves like an inch worm. I believe this first pic is it small - that is a 2" marine pure cube for scale.

And this is it (maybe) a few weeks later, with a buddy.

And the video to show how it moves. Right after I shot this (just after lights started ramping up) it disappeared and have not seen it for a bit. (nightmare fuel below) It looked to be about 4-6" in length here and could stretch out quite a bit.

 

[duberii]

Maybe a medusa worm? I think I am making out feathery feeding tentacles and some type of feeding behavior that looks like medusa worms, but I've never seen them move like that.

 

[KJ]

Medusa worm!

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[lafarrow]

It does look like the medusa worm - I was cleaning my sump today and they really like to be at the base of my red ogo - when you run your hand through the macro they will stick to your hand like glue - they cluster together at the base of some of my ogo - the one i took a pic of is by far the biggest one. I'll keep an eye on them and let you know if i see them doing anything else!