Can someone ID this please?

I'll try and get a better pic. I think it moves on its own with those whip like things as all pumps were off except return, so it could be current. I dunno its just freaky to see lol! I'm kinda scared to put my hand in the tank lol!
 
I know there's a sponge that walks around that looks similar to that. Wonder if it swims?
There's also a type of aiptasia/nem that swims, but I can't tell if yours is actually a ball shape with little tentacles or if that's a balled up nem and the tentacles are longer than they look.
 
The best way I can describe it is this: its smal maybe the size of a formula 2 pellet, it looms like a single celled microbe thing and it has tentacles all over the ball that whips out in all directions super fast. It's like those pictures you see on tv that shows a cell up close with flailing arms everywhere.
 
I just read that sponge larvae can swim, but I have no size reference in anything I read LOL.
Close up pic is gonna be a must here (for me, anyway LOL).
 
Well I sent an email and a link to the video to the guys at Wet Web Media, so hopefully they might be able to figure this out. That or some mutant will crawl out of my DT in a few months haha! Ill keep things posted here if I hear back from them.
 
Okay Jordan from Wet Web Media replied and stated it was a "Spintheridae Worm". Feeds on sponged and possibly hydrozoans. Not a common hitchiker, but nothing to be overly concerned with.
 
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