Hey PH, I wouldn't bet on them only hanging out in the top few inches of media. Ive found fungus gnats coming out of the bottom of my containers, and found the larvae on the bottom and lower sides before. Nasty little fuckers.
If you want another all natural way to deal with them, try beneficial nematodes. They work great. Typically takes a week or two to see results, but you'll go from gnats, to none very quickly. Every so often, Ill pick up some more nematodes and reapply if I see gnats returning.
Btw, you've got a great looking garden going there. You do it very well with the organics.
Hey Dave
You are right the little fuckers will back door you through the weep holes in the bottom of your pot......set up camp there too.
I did not mention this in my post.
I put duct tape over my weep holes.....I never steam this area!
the duct tape does two thing.....closes the door on our little scummy friends and 2nd slows water down leaving the pot.
I think if you're using root pruning bags/pots...they are coming from all angles.
Nematodes
I did a quick peek and found this is a tapeworm of some kind....Interesting.
Do they feed on there eggs until they are eradicated?
Biological warfare ...
Great share and I love your indoor Sativa work......I go to bed at night dreaming of that durban that you had curing in the corn husk with the purple bleeding through......Killer
Great share