Why are my plants looking like this ?!?!

went out of town for 3 days and came back to this Currently under the vipar spectra p1000 humidity has been between 35 and 60 and temps did get hot while I was gone up to 90 the highest they are in foxfarm ocean Forrest and have been feeding ph water at 6.4-6.7 and have fed once with advanced nutrients 3 part