Wilt

What causes lower leaves to wilt ?my tent got up to 90 degrees today also it looks as though all there leaves are getting thinner in width.I topped about a week ago they seem pretty healthy except the aboved mintioned SHOULD I WAIT TO FLIP ? Also IV been using Flora gro systems in Fox farm do I need to do anything before I flip as far as nutrients go?

I see a little bit of clawing on some of the leaves. That might be high nitrogen. Are you measuring the ppm/EC on your nute mix?

90F is too high. Do you have any way to get it down to 85F? Since theyre filling out the tent now, they will stretch up significantly in the first three weeks of flower. It's about time to flip, but since you just topped them, I would wait like one more week to allow the new side growth to develop a little more.