What could it be?

Anyways, it is a worm that is maybe about 4mm thick and about 1 inch long and it looks like a centipede because it has millions of legs all around its body, from its tail area to its snout end. It seems to have little antanae at its front end with tiny black eyes, and if I can see correctly, it seems to have tiny fangs, well it looks like it for his mouth. The back end is pretty much white and the front end seems to be a bit pinkish. It was swimming around the tank and squiggling all over. Any ideas to what it could be? All I know is that it isn't a bristle worm, and it's almost impossible to get a picture of it.

Thanks.
I tried my best on the pictures...
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oh and it swims like this: http://www.youtube.com/watch?v=DhoHlFJGBBo

ohhh I found it on youtube. What is it? Or is it just a bristle worm??

http://www.youtube.com/watch?v=Im_rl7lsZ_s

ohh... do bristle worms even swim around?

thanks.