Not sure what this is. ID please?

[xXAXELXx21]

Hello everyone!

Not sure what these are, they don't seem to bother any of my fish so are they good guys or bad guys? If bad what can I do to get rid of them. They hide when ever a shadow passes over then and only come out during the day. Thank for your time!

 

[cloak]

Spaghetti worms most likely. (good)

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

 

[xXAXELXx21]

Thank you!

 

[Salty1962]

Spaghetti worms most likely. (good)

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

+1, they also come in red.