Hi Mate, for commercial use Amblyseius andersoni and adalia bipunctata are mites and spider predators but are unuseful for soil mutes fight. Fungus Gnats are the most common critter from soil usually thei damages never hurt plant. To fight them U can use yellow sticky traps (adulf control) nematodes or natural predators (Hypoaspis aculeifer) or just allow the soil to dry to a depth of one to two inches between waterings. This will kills larvae and inhibits the development of eggs. If U check my diaries, they are filled with photos of several weed bugs
Check the video at 12th week here:
growdiaries.com/diaries/61057-royal-queen-seeds-special-kush-1-grow-journal-by-rapacap/week/347421