Bug ID Please.....

[blk822822]

I have a small tank curing some lace rock in the garage and noticed this Feather duster looking worm on the glass. It's green and moving ,feather on on end moving the other way and maybe 2.5mm or shorter long.

I have these pics they are dark but you can see the critter.

 

[user 26995]

looks like a Sabellidae type worm.

 

[blk822822]

So just a small feather duster worm without a shell. A baby...lol