I am having some issues identifying these spots on my leaves. First grow hydro, closet, have hgl 550 at 70ish percent, 24” off canopy, good airflow, temps between 60 and 75, humidity at 25%ish. Growing Wonder Woman from seed. Plant is about 3 weeks off seedling, looks healthy otherwise; it’s bushy if anything. Roots are white. Using general hydro flora for nutrients with a pH consistent at the 6ish range. At first I thought a little sunburn, however these spots are appearing more frequently as the leaves grow.
I’m shocked. I do use RO water, but I supplement with CaliMagic. I was using the “use less than recommended” approach, but I suppose this is my wake up call to stop doing so with the cal. Many thanks for your advice.