Rove Beetles; We moved these in from outdoors where they remained and flourished in natural living soil. They were quite effective in keeping most pests (thrips, gnats, mites) controlled. They seemed to prefer the bad bugs over lovely ones like springtails
http://greenmethods.com/biocontrols/atheta
http://www.oisat.org/control_methods/natural_enemies/predators/rove_beetles.html
http://toxipedia.org/display/ipmopedia/Rove+Beetle
http://greenmethods.com/biocontrols/atheta
http://www.oisat.org/control_methods/natural_enemies/predators/rove_beetles.html
http://toxipedia.org/display/ipmopedia/Rove+Beetle