Not to rain on the parade, but removing what you see will result in the same picture very shortly.
If you have those worms out 'n about like that, you haven't even scratched the surface of what ya got in there.
They'll balance out the population on their own. It will still be a huge one (most are), but it's not like you'll have nothing but worms in there. I think on an old computer I have the pic (or maybe Smitty does) of the largest one I've seen in any tank. I will ask him about it, and see if he has it. We went ahead and laid a tape measure out because you wouldn't have believed this behemoth was close to 3'. Yes, feet. And it was gi-normous in it's girth. Definitely some in-breeding going on in
his tank! lol I've had some pretty big ones, but never that big.
As to your clown, it's usually anyone's guess when it comes to one dying, unless you were cycling with one. I didn't see your params, so I don't know. But as for one of those bristleworms nabbing him? He would never have allowed it. But a small fish like that can die one day and be completely devoured the next, just by a cleanup crew.