As my grow gets bigger, so did the gnat problems. Keeping the soil dry enough to stop them was a problem. So this is what I did. When I did my transplants into the solo cups, I cut the bottom out of them and sealed with newspaper. I then planted the cup and rooted cutting into my grow bags. The newspaper dissolves as I water the plants through the opening of the cup. This keeps the top of the soil dry and waters the plant as needed.The water disperses throughout soil and waters it below the gnat larvae. I then take a small amount of DE and cover the soil inside the cup opening. The small amount of DE is much easier to use than trying to cover the soil in the bag. Also, my fans don’t blow it all over the place. I have also increased the air flow inside the tent. Instead of hundreds of gnats on my sticky traps, I see only a few. FUNGUS GNATS suck.
PS I have so much more time to love my girls since the Corona-19 virus. Donald Trump is dangerous and must be stopped in November. At 71, I am not ready to go because of his ignorance.