Vermetid snails are not bad.... but I am not convinced that is what you have. My vermetid's 'fishing line' does not retract when a fish swims past/near it. I am thinking you may have spaghetti worms as Witty suggested. I have lots of those in my tank too (they are not bad either). Spaghetti worms do retract quickly when disturbed. Here is some info on spaghetti worms:
http://www.wetwebmedia.com/polychaetes.htm Quote:
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Loimia medusa (Savigny 1820), the Medusa or Spaghetti Worm. Cosmopolitan; all tropical seas. Found between rocks in silt to sandy substrates. Tube-dwelling (family Terebellidae) worm that is most often recognized by its extended feeding tentacles. Hawai'i image.
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