Worm with a Web...What is it?

[6mmmedic]

I have three of these on my live rock and have no idea what they are. They are some kind of worm looking thing in a coccoon and they spit out a web and pull it back in. The coccoon are getting bigger. The black spots on the pics are the spots I'm talking about. The first one was taken last week and the other two tonight. You can see the growth of the coccoon in just a week. What are they and should I be worried about them?

 

[mr.clownfish]

i dont remember the name, it starts with the letter V vietnamis snails or something like that. there good, they capture extra foot that goes by.

 

[sickboy]

vermitid snail

 

[pastor b.]

Dear hobbyist, I have quite a few of these snails within my tank, they multiply quickly. These snails are filter feeders, they put out a web like string which traps nearby floating food, then they bring it back to their mouths, these are harmless snails, they're just an eye sore to watch.

 

[renogaw]

Originally Posted by Pastor B.
http:///forum/post/3006740
Dear hobbyist, I have quite a few of these snails within my tank, they multiply quickly. These snails are filter feeders, they put out a web like string which traps nearby floating food, then they bring it back to their mouths, these are harmless snails, they're just an eye sore to watch.
I wouldn't say harmless... darn things are webbing all over my sps and clam... i'm breaking them off whenever i see them.

 

[sickboy]

I just stuck the tip of the super glue (lock tite gel) into where I broke it off and it died.

 

[6mmmedic]

Thanks for all the replies! I havent decided what we will do with them. For now I guess we will just keep an eye on them.

 

[cranberry]

Excellent picture!!!!!!!!!