One to cull and one to keep - one runt, one maybe sick

[AutoWonders]

I opened up the ones on the bottom and it seemed to help. Also, couldn't I just add another 6" inline fan to one of the bottom screens to help the pressure regulate?

I have incoming (passive) air through my tents left side lower screen and the air extracts from the right side, top sock. The air travels through my plants, up then out.