What can it be ? I have this girls that are lighter green than other and they have this spots on the leafs, may that be over fert as last feeding i had quite high ec.
I feed them today just water.
Used cal.mag
Canna AB
Rizhotonic
Canazym
Looks like a number of deficencies to me. Red stems, yellowing between the veins, but could be lockout. What PH is your medium? Is it soil or coco? Are you using tap or ro water? When did you last feed and at what EC?
You have a ph issue causing multiple issues from the lock out of nutrition. It likely spiked low due to the extra fertilizer. Flush the substrate with appropriate ph water for your substrate. Then apply a normal feed.