Sorry for your troubles, Lake Tuna. I don't keep shrimp (yet), so I'm unable to offer any advice. Your post did catch my eye, though, but not for any reason you might expect. Being unfamiliar with shrimp keeping, I'm also not aware of their parasites or their names. But when I saw the title of your post, my first thought was of a tasty Italian seafood/pasta dish. Although I must confess that I've never eaten Vorticella before (that I know of), I have had vermicelli before and enjoyed it. And, of course, I LOVE most any dish that includes shrimp, so "Shrimp and Vorticella" sounded rather tasty and it got my mouth to watering! Now, thanks to you, I can't get Red Lobster out of my head! Thanks alot, now I have a craving I can't get rid of!