Good start on first grow. Smaller tents have issues that need to be looked for that bigger space dont like overheating, big temp swings, and most important for your question white powdery mildew, mold due to humidity issues , lack of air flow and TOO MANY LEAVES ON LEAVES. looks like you are keeping it tight on the defoliation . Growing knowledge becomes easy getting things dialed in and right is the hard part and never stops. Learning constantly ways to keep that grow room dialed in is everything. Balancing nature to achieve awesome results good luck.brood