What is this????????

very true lol ;D

 

so the verdict is mutated bristle worm? haha

 

The scary thing is that the thing on the right is the magnet on the frag rack... How in the world did he fit in there?! Aquarium magnets are so strong! Anyway, My zooglogy teacher emailed me back. She said:

it does look like a bristle worm which would mean it is one of a group of polychaete worms (Phylum Annelida, Class Polychaeta as you may remember). From the look of it, it may be a worm called Plathynereis (parapodia and associated setae are longer than I would expect on these guys), but it is hard to tell. Worm identification is notoriously difficult and often requires looking at the animal's jaw.

So I'm still open to suggestions..