Predatory Mites (Hypoaspis) with Nematodes as a food source. These are about the same size as the white slow moving pest mites that they are said to prey upon. To sustain for any length of time I found they did much better when feeding on Fungus Gnat larvae (also known as Scarid Flies). They are primarily sold to control this pest.
Biological control of sciarid larvae with the entomopathogenic nematode Steinernema feltiae
"The Bugman" - March Biological Control - How To Use Beneficial Nematodes - Fly Control -
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