war of the midges! im totally outnumbered

hey riu. ive always had a few small winged midges floatin about ma grows. have never really been to fused either. i have two awsome gals half way through flower and have noticed a huge increase of them in my flowering tent. i just flushed and doing so flushed out litterally hundreds of larve. im in coco in a pot in pot style run to waste. these midge larve where living in the approx 2mm of water that sits in the bottom pot, its as low as i can get the drain hole without it being on the bottom side of the pot.

after flushing all these came out. how is the best way to totally get rid of these fukers safely? can i plug the drain hole between waterings to stop these breeding in there?

please help as im totaly stumpped with this issue.

They like soil thats too wet. I use BT in my water some times, sticky traps, DE in soil..have used azamax at times. The BT did a number on em.

Gnatrol works by all accounts.