Hey blazed those plants seem to be doing better now. You say your running a 400w, I'm using 270w in a closet 5x2x8 and when lights are on I have a 100cfm cage and 465cfm cage exausting air at the same time and temps still climb to 81-83
degrees F. Not sure what that is in celsius. I'm kinda like most of us I thought my oversized computer fan would do the trick but now that Ive got more airflow I wouldnt go back.
Good luck w/ the grow.
Oh yeah dont be afraid to hang fans w' something as simple as bungee cords- it keeps the vibration to a min
465 cfm fan is loud as shit, didnt cost more than 120$