I noticed these yellow leaves started when i changed the cycle. I cut down on the bloom nutrients and drained it with water but it is still curling and turning yellow from inside. what should i do?
Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins