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willowdog96
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How long has it been since you calibrated your PH pen?
Mg will generally show up on older, lower growth first. Your stats seem to be in check, but there are a couple of unaccounted for variables. Namely light and water. Are you using R/O or tap? Could be some other micro-nutrient deficiency. A zinc or manganese deficiency can look sorta like that, as can Iron.
I know you mentioned that you know your LED's aren't too close, but... did the plants veg under these lights as well? Can you think of anything that changed close to the time the condition started?
In my own garden anyway, it's always been one of three things anytime I end up going in circles trying to solve some mysterious leaf appearance. PH, RH, or a motherf*cking LED that I knew was the perfect intensity at the perfect distance.
I suppose bugs of some sort are a possibility, but I try not to be too quick to jump to that conclusion without seeing them directly. The margins of the leaves aren't super happy either... and the tips, I can't tell if they look yellow or brown. I've had some plants that would only indicate a P def. with brown, up-curled tips, in which case they may just want a bit more EC, which wouldn't be unusual if you're using RO.
In the end though, it sure seems PH related if you consider all the signs the plant is showing. You said you're in "hydro", but didn't elaborate. Growing in buckets? Coco? Rockwool? Any other inputs besides base nutes? This all matters a lot.
Why are you using RO?
Very well saidWhy are you using RO? What's wrong with the tap? If it's just way to hard, mix it with your RO before adding nutes. If however, your tap comes out .5 EC or under, then move your RO filter up to the kitchen, drain your reservoir, mix your nutes with tap water, and watch your problems disappear.
The topic of RO water is not discussed intelligently enough, and there's this terrible misconception, that it's always better than tap water. RO water should be used when the requirement for such has been established, not simply because it fit in the budget when the grower went on the initial shopping spree. Generally speaking, those that are successful with RO, are not your average off-the-shelf-from-the-grow-store gardeners. They've spent a serious amount of time figuring out their nutrient profile, accounting for every last micro nutrient required, and every thing in specific ratios to one another. When you just want to dump something out of a bottle into a bucket, the micros and ph-stability of tap water will keep you in the "easy zone".
If you absolutely must stick with RO, attention to your nute program is in order. They're not getting something they need, and it's either because it's not present, or present and unavailable. Both of those come down to whats in the solution.
Confirmed, my tap water is about 0.4EC; a tad high.
Hey that's great! .4 is fine.
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