Clam killing bristol worms!!!!

[The Grizz]

So a couple of days ago I notice one of my large clams was looking a little funny, not fully opening. Then 2 days later the light's came on and all that was left was a shell and a big chunk of clam guts floating around the tank.

I lifted out the shell and to my surprise there was a bristol worm under it about 1 1/2" long, out came the tongs.....bye bye worm. I put the shell in a bucket with hot fresh waster to soak the shell ( wife wants to keep it ) and after about 10 min soak I pulled it out of the pail flipped it over to find 3 more bristol worms sticking out of the part if the shell that was still joined.

Has this happened to anyone else??? Should I move my other large clam off the sand bed as well??