Not coming up on any critter ID page...

[Jaffster]

We have a few of these in the tank, they only come out at night. Any idea what it is?

 

[Anemone]

Looks like a hair worm or spaghetti worm.

http://reefkeeping.com/issues/2002-06/rs/

Kevin

 

[Sugar Magnolia]

Yep, harmless.

 

[Ccoffel81]

+1 looks like it to me

 

[Jaffster]

That seems to be it... Thank you everyone!

 

[Bryanmc1988]

If you don’t mind me asking, how did you think your tank came into this? Did you use live rocks? Old sand? Etc?