Yellow leaves keep showing up

Hey Growmie, Your plant is suffering from a magnesium deficiency, the light green, or yellow coloring that begins to show on the veins and edges of the lower & older leaves – this is one of the classic signs of cannabis magnesium deficiency. You may also see red stems. After reading your diary it looks like you just need to go up on the dosage of Cal-Mag, and this should help, everything else seemed to be right where it needs to be. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.