Can someone tell me what this is?

[Reefs Unlimited]

I noticed this tube the other day. It has started to grow. I have looked around the internet and couldn't see a pic quite like this one. I'm thinking it's some type of worm. Wondering if it is beneficial, if not how do I get rid of it. It's the white tube running down the side of my cyphastrea and now has crossed over to the zoas on the right. Thanks

 

[tidus10]

my old rock had that ALL over it, if i remember correctly it was from worms... never effected my corals or anything.. had a few that were a couple inches.

 

[Mike J.]

I could very well be a tubeworm that builds a mucus lined tube. Or it could be a zoanthid spider. I'd look at what's in the tube to be sure.