https://en.m.wikipedia.org/wiki/Rotifer

Rotifers, wheel animalsor wheel animalcules, make up a phylum (Rotifera) of microscopic and near-microscopic pseudocoelomateanimals.

Rotifers Predators:
Tardigrade

https://en.m.wikipedia.org/wiki/Tardigrade

tardigradesare 0.3-0.5 mm

tardigrade species, Macrobiotus richtersi and M. harmsworthi effectively suppressed nematode populations.

Role of tardigrades in the suppressive service of a soil food web

https://www.sciencedirect.com/science/article/abs/pii/S016788090700237X

Tardigrade species composition in young soils and some aspects on life history of Macrobiotus richtersi J. Murray

https://www.sciencedirect.com/science/article/abs/pii/S0031405606000114

An integrative description of Macrobiotus shonaicus sp. nov. (Tardigrada: Macrobiotidae)

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0192210

..

https://en.m.wikipedia.org/wiki/Macrobiotidae

https://en.m.wikipedia.org/wiki/Macrobiotus

https://en.m.wikipedia.org/wiki/Macrobiotus_shonaicus

https://en.m.wikipedia.org/wiki/Milnesium_tardigradum

https://en.m.wikipedia.org/wiki/Milnesium

The mouth of Tardigrade has a wide opening, so the animal can eat rotifers and larger protists.

https://en.m.wikipedia.org/wiki/Parachaela

https://en.m.wikipedia.org/wiki/Eutardigrade