Re: What the heck is this thing? [photos]
Appears to be a Loimia medusa, the Medusa or Spaghetti Worm.
My guess is it was dislodged from the sand bed while I was cleaning the front glass - the magnetic glass cleaner I have sticks to the glass so hard that the piece inside the tank "jitters" across the glass. Earlier in the day I had got it a little close to the sand and it "jumped" into the sand about a half inch. I was trying to clean the glass near the surface of the sand bed along the bottom but the cleaner was uncooperative. I think i'm going to get a tiny cleaner instead of the big one I have and use the small one for the corners, etc. Hopefully the smaller cleaner won't jump around.