Stringy thing bothering my zoas

[StuInFlag]

I've had a small rock which is covered in red and purple zoas in my tank for a month and a half or so. They are starting to spread, which is really nice. But, I have a couple hitchhikers.

One looks to be a very small fan worm. It's so tiny right now it is very hard to tell. It's in the upper right of the photo below.

The other I can't tell what it is. It definitely irritates the zoas nearby. It looks like 5 or 6 half-inch long, hair-like, stringy things. When they touch the zoas, the zoas close up. I've tried to get picture and just haven't had much success.

Any thoughts?

 

[little_fish]

The stringy thing is a type of snail, i would suggest glueing the tube shut. they arent harmful, but they can bother corals.

 

[Salty B]

A better pic would definitely help. I dont see any vermetid snail tubes so cant rule it out.

 

[Waddi]

I say vermetid from the tube like description.

 

[StuInFlag]

Still no good pictures, but I pulled the rock out this morning and looked at it. I didn't see anything that looked like a vermetid. The stringy parts were multibranched and seem to originate from the rock. I held the rock under water while my son used tweezers to remove as much as possible of the thing.

The fan tube worm has really taken off.