This first image shows a large number of rotifers along a single blade of decaying grass. While I can find these rotifers regularly this time of year I seldom see this "density" in one place.
Nikon MM-11. Olympus 5/0.15 MPLFLN. Darkfield.

I included this next shot because it showed something I had not expected. There was a blade of grass that had about 6 or 7 very "young" rotifers just starting to build their tubes. I had always imagined that they started by attaching the base layer of round "bricks" directly to the surface. But all of them were attached by their foot, and the newly started tube was not actually attached to the substrate.
Olympus BHS. Olympus 10/0.30 S Plan Apo. DIC.

The last two shots are with a 40X and 60X, DIC, showing details of the cilia in motion.

