yellow stringy substance

I recieved some live rock from someone in the dallas area and after a few weeks a small yellow stringy clump appeared. It spread out in a pattern with a main centerpoint with several strands coming off, and then started multiplying. It never grew in thickness, only in length. It looks like sombody took a spindle of yellow string and threw it all over in the aquarium. I've searched the internet and asked few people and no one knows what it is. Does anybody here have any ideas as to what it could be?

Can you post a picture?

I love a google challenge
Is this any good?
http://www.thereeftank.com/forums/f6/white-strings-growing-on-rock-158560.html

They talk about something similar to that which you described.

ive got some vermetid snails in my tank that put out stringy mucus looking stuff sometimes. dont have a pic tho...

Sounds like Terebellidae, or more commonly called spaghetti worms. Good bottom feeder.

it looks almost exactly like the pictures of the spaghetti worms but with no body. i'll try to get some pictures. how do you host them on here? through photobucket or a similar site?

I've never seen the body on the ones I have in my tank either. It is usually buried in the sand or the rock. I think all of mine have migrated to the sand.

Here's the link for how to post pics:

http://www.etakc.com/t119-how-to-add-a-photo-to-your-post

sorry for the wait but heres an ok picture. my cell phone doesnt do the best. one thing i did see is some of the strands coming from in between the glass and hydrometer and there was no body...how small are they?

http://i62.servimg.com/u/f62/16/22/21/65/imag0012.jpg

Yep, definitely a spaghetti worm. Can't say I've ever seen the body of any of mine though so I can't answer your question.

ok. are they harmful to any corals or fish?

Nah, they're good for the tank, eat the bad stuff and left over food.

Here's a link to FAR more information than you probably really want. Taken from the wetwebmedia site.

http://www.reefkeeping.com/issues/2002-06/rs/index.php

awesome. thanks everybody.