Red to the naked eye. Very small. Thought bristle worm at first but under magnification I'm not sure.
Maybe a baby work.. Only about 1/2" long when moving
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Many pics to reference. I agree with Wiz on this guy.
You didn't want to point your finger at the Eunice worm??? Haha.It's definitely a Dorvilleidae. Supporting evidence.... that's my finger up there pointing at that tiny worm. I saw it under magnification as well. That pic is a very tiny version of a much larger image. If you look really close at the worm in action on the glass, you'll see his mouth parts moving as he rasps algae. A very interesting critter. Moves different that your regular bristleworm.
Those Eunice photos are also my worm/pic. I had him in a tank by himself for a couple of years.

