Geez man, I can't beleive how big and thick the buds are on those guys. You're going to have an awesome yield! Did you use the full dose of Fox Farm nutes? I did on my last feeding and I'm seeing very slight yellowing/browning at the tips of the leaves. You'd have to look to see it, but it's there. You may be too close to finish to notice it on your plants though, as the leaves begin to yellow naturally at a certain point.