Is plant missing something in its diet

Zhittlez auto grown in promix and ewc using dutch science veg nutes. Temp 75-77 ph 6.3-6.5 lighting Photonteck 600 lighting 18/6 humidity 54 percent. just on one set o of leaves.

Your temperature is too low for LED. But you’re in hydro and I’m assuming you’re not using a chiller. Where on the plant are these leaves?

Right on top of plant

It looks like water "burn" or chemical burn when I place the plant under light too soon before the spray dries after a foliar spray........................ especially on leaves closest to the light source. If it does not progress i think it is a gone issue.