there are 2 doors one on each side and 2 windows so i think they have plenty ventilation. the coop is 6x8.
Hmm. That does look like good ventilation and the size is generous for 8 birds. Also, I see 2 perches so there *should* be space for two groups.
I had some birds go through a sort of "teenage rebellion" stage where they tried to roost in the run instead of going into their coops at night. I kept herding them in and closing the pop door until they finally got the idea.