I have up for ID these two "things".
The worm thingy sends out a "slime web", then reels back in whatever he catches and eats it (I guess). It's shell/tube is hard, like a cocoworm.
The other thing looks like some type of anemone to me. It must have came in as a hitchhiker on something. It's way in the back of my tank. I was able to get a shot of it when I move my Galaxia out of the way. It's foot is what reminds me of anemone.