Id

[mark peacock]

Hi i have what looks like a tube worm about 4 or 5 of them brown and coiled like a worm and they produce a spiders web type which attaches to anything it can get to are these reef safe my pulse zenia had it on it and does not seem to be looking all that great.
mark

 

[NaH2O]

I suspect they are Vermatid Snails. Here is a video of them eating: Feeding Behavior of a Vermetid Gastropod

Also, this article: Worms that ain't....Vermetid Snails In Marine Aquaria by Ron Shimek

 

[dj tryrd]

I would check out madusa worms, terribelid worms, curriolid worms,or space aliens. shhh dont even think of what you just read.(they can read minds, man).