GrassTown
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Does this look like potassium deficiency?
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mysticepipedon
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Yes, it does look like K deficiency, BUT it may not be.
Do all the lower leaves have the symptom, and it gradually disappears on the leaves above it? If so, it probably is a K problem, though it may be lockout rather than a deficiency.
If all the lower leaves do not have the symptom, but only leaves getting direct light from your LEDs, it's light burn.
I can't tell from your pics which it is.
Do all the lower leaves have the symptom, and it gradually disappears on the leaves above it? If so, it probably is a K problem, though it may be lockout rather than a deficiency.
If all the lower leaves do not have the symptom, but only leaves getting direct light from your LEDs, it's light burn.
I can't tell from your pics which it is.
MEGA956
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Purple stems aren't a good sign, best of luck to you.
GrassTown
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It is mainly on lower, upper leaves aren’t as bad but seem rubbery. Could be a lockout than.
mysticepipedon
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Sounds like nutrient problems. @MEGA956 pointed out the purple stems. Any possibility you over did it with calcium? That could lockout P, K and Mg, as well as others.
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