Hello, first grow here just curious if this is genetic related or if this is the start of a deficiency. The top parts of my LEAF stems get this purple coloring to them almost like a sun burn. My light is not too bright it is an agriculture 125w grow light ( 18/6) and the purple is only on parts of the stems that receive light. It's not on the underside of the stem. It's also only not in the veins of the leaves either.