Wierd Tubes

[havoc1010]

I have some tubes on my rocks that stick out from the rocks. I don't notice anything untill I stir up the tank and then they put out these little strands, smaller then spaghetti worms. They don't seem to harm anything just the looks of the tank.

Anyone know what it is?

 

[Paintbug]

Vermetid Snails, heres some info
http://www.reefs.org/library/aquarium_net/0897/0897_8.html

heres a pic of some from my tank without the mucus webs.