When I posted the URL to the fungus gnats site just now, I was reminded of the existence of predatory mites. Some of you speak of having a red bug on your plants, and we usually assume it's a spider mite. It might behoove us all to look a little closer.
http://www.nysaes.cornell.edu/ent/biocontrol/predators/mitintro.html
http://www.nysaes.cornell.edu/ent/biocontrol/predators/mitintro.html