Co2 room plants yellowing skinny leaves

Room is 11x11x8 4,000 watts double ended bulbs sealed only exhaust at night. Temps 82-86 ,40-55 rh lights on. 70-74 65-70 rh lights off. Co2 set at 900 ppm-1100. Soilless sunshine mix #4 fed with full cyco nutrients at 1.2-1.6 ec plus ro water. Plants seem to yellow all around , skinny leaves and growth is not aggressive. Roots look okay.

Ph 6.2-6.5

Are you feedin em any Cal/Mag? hard to be sure with your pics but it looks like a Mag def

Only been feeding with cal mag few times. And foliar spray twice with botanicare cal mag twice

Struggling wit the same thing with the cyco line up. Try droppin your ppms. Seemed to help on my side. Are you using dr.repair?