Shrimp tank micro critters - Not hydra

Found these absolutely microscopic little trumpety things in my tank last night. They’re literally just a few millimeters in length. Had to get my 60x and 90x jeweler’s loupes out to try and get some pics or video footage of them. Some folks ID’d them as stentors.

In the video, you will see one of my shrimp’s whiskers bap the trumpet and make it shrivel up like a coral or anemone. Takes it a minute before it slowly comes back out of hiding.