what do i have now?

[stonedage]

I bought a small peice of LR covered in zoos and lately I have seen something on the rock that i dont know what it is but am quite curious cuz it is definitely alive. It is really small being around 1/8" and looks kinda like a closed zoo but it has 2 hair like things that it sticks out and feels around with, and looked like attached food to them, then retracts them completely inside. I have seen the hairs out about almost 2" and they move around like feelers looking for stuff. I can and will try and get a pic of it but it is so small that I doubt anything will actually be visiable. any ideaas at all? thanx
SA

 

[reefnut]

Some type of tube worm...

 

[stonedage]

and is that a good thing?
SA

 

[reefnut]

Yes... they will feed on food and waste particles and help keep the tank clean.

 

[stonedage]

i just did a search and found a great pic of exactly what it is, and thak you for your help, you were dead on....a suspention feeding tube worm. guess ill have to watch it grow now yay. thanx again!!!!!!
SA