Don't know what it is?

[Mantafish]

Its hard for me to get a good pick, however I will try to explain what it is and I am shure someone will know. It seems to be growing on the side of my liverock. It lives in a hard calcium like tube and has tentacles. I see it fishing alot with a salive like net. When it catches something like mysis it reels in this saliva web/net. I have no clue what it is but its like a weird snail or something I just cant explain. HELP

 

[capncapo]

Vermetid snail. Harmless.

 

[mejiggery]

are'nt they fasinatling to watch
Welcome to reef central

 

[Mantafish]

Thanks for the info. An they are facinating to watch. Its like a little fisherman in a tube. lol