As for controlling grain mites - indeed, the population of these can be reduced down to negligible levels when Hypoaspis is present.
When I used predatory mites, I never had mite issues again. And eventually the predatory mites died out leaving me with just a container of pure insects (of whatever I was breeding (roaches, beetles, etc.)). Unless I brought in untreated leaves or new substrates and such, then mites returned cause they were brought in.I have them circulating my enclosures, never seem to die out, between grain mites, fungus gnats and the several springtail species in my enclosures, they always have food available, and seem to cycle between crashes and booms in my collection.
If buying from a good company, they will sell different predatory mites that will do better in different conditions (for example: moist conditions vs. drier conditions). I remember a great company based out of N.Y. but I can't remember their name.
Good Luck Everyone!
