Needweedstarted grow question 2 years ago I got my bubble kush auto from RQS 65cm high here, in week two of flowering. This sign appears on older leaves. 4 days ago i did a flush and after dry, lightly fertilised with 450ppm. Last watering with runoff check. The ppm was cca the same(450).My tap water is 330ppm already.
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Leaves. Color - Yellow