The shrimp escaped! I heard a little plop this afternoon, and the little guy was scurrying around the sandbed. I'll be watching him closely until tomorrow when I can see to fish him out.
The anemone is improving! It's becoming much more sticky. It now picks up
sand and small rocks and shells as it rolls around the sandbed. Plus, as I was feeding the fish today, I noticed that the anemone's mouth was slightly open - not gaping, but just a bit open, and I've read that means that the anemone is hungry - so I dropped a mysid shrimp onto one of it's tentacles. It stuck, even in the current! Not sure if it ever actually ate it, but the shrimp is no longer stuck to the tentacles. If I can get it to eat, I'll feel a bit better about this guy's chances - it's continuing to expel zooxanthellae.