Satorsanswered grow question a day ago Hi bro,
The most prominent symptom is interveinal chlorosis, characterized by yellowing between the leaf veins while the veins themselves remain green. This is a classic indicator of magnesium deficiency. In some cases, the leaves may also exhibit downward curling.
To address this, I recommend applying a foliar spray of Epsom salt (magnesium sulfate) during the dark period. Plants are generally more efficient at absorbing magnesium under low-light conditions.
Best of luck buddy.