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p4tm_CHEF started grow question 3 years ago
Pic week 7 (2/3/19).

Last couple of days started getting this discoloration on a few.

Had deficiencies in past but were usually spotty & random which ended up probably being calcium def...have added CalMag this go.
This is spaced specifically in between the veins. Please&TY.
Resolved
Week 7
Leaves. Veins - yellow between
DissNoof answered grow question 3 years ago
hey the p4tm chef, pretty much standard magnesium deficiency , most likely due to the tough light schedule and the light being just a little too close, raise the light by like 2 or 3 cm and give them another hour of dark (you can give more but i'm guessing you want to keep the intensity up) OR you can put 1.5 ml / L cal mag in a spray and spray it on at light on and lights off ever 3 days for a week 10 days and the problem should stop spreading. hope this helps ! :rocket: