I’m in a 4x4 with an FCE4800. It seems like the yellowing has slowed down a bit or stopped completely. Fingers crossed. I worry so much because my last grow did not go so well, and these plants were showing similar symptoms. Hopefully everything is in check now!i wouldn't let this stress you out, bro your gonna get some great bud off them also what size is your tent I'm just curious also I never use a chart none of that vpd either and if I keep my rh around 50 rh I'm happy and temps never really over 80f