grow tent setup

Do you guys think I can get away without putting an intake fan in my 4 x 4 tent? I have a carbon filter attached to an exhaust fan so do you think I can get away without putting an intake fan? Or is it a must in a 4x4. Also if you think I can get away without putting an intake fan in do I have...

So I flipped to 12/12 because of height concerns (hoping the second one gives some height perspective). The Nitro had a bit of root rot and fungus gnats so I hit the soil with a 1:1 solution of hydrogen peroxide and RO water and covered loosely with foil to contain the gnats while the larvae...