Worm??

We just noticed this in our tank today. We are pretty sure it's a sipunculida worm (peanut worm), but having never seen one in real life, we can't be certain! It's definitely giving me the heebie jeebies though!! Can anyone help ID this?!
Also here is a video of it in action!
<iframe src="//player.vimeo.com/video/118741066" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="

">Worm</a> from <a href="http://vimeo.com/user16851690">Brittney Fusco</a> on <a href="https://vimeo.com">Vimeo</a>.</p>

 

Looks and sounds about right.

Here is an ID link for you.

http://chucksaddiction.com/hitchworms.html

 

eeeewwwww!!! it would give me the heebie jeebies too

 

Made the mistake of pulling this link up while eating lunch. Thanks Cheryl

 

I found some to be quite stunning.lol

 

Thank you! We haven't even since it since i caught it on camera, but im always amazed by how much life is in the rocks on the rare occasion that we catch a glimpse of something like that. I think its "mouth" grossed me out the most, but it was still pretty cool to watch!!