So both res' look good. The res with the stunted forest has the beneficial bacteria and the new Sour Crack seedlings are in a sterile RFS 550 ppm Grow solution. The 8 new Sour Crack look happy and the stunted forest is in a 1100 ppm of RFS Bloom nutes.
My guess would be calcium, brown rusty spots are usually a sign of that. Especially as its on new growth too. You tried giving a little more calmag. Just my guess maybe check it out with someone more experienced like waira or oldster mate
Thanks sanguine, It's at the top of the plant. It may be a water spill. With all of the abuse these plants have taken I'm surprised they aren't all like that.
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