Removed answered grow question 4 years ago Wow those are some dark leaves. Go easier on the nutes, at least on the nitrogen levels, you have N toxicity Avd maybe some excess P too. If the spots are on the newer / top leaves then yes, it is lack of calcium. Although by the look of your leaves I'm not convinced it's plain calcium deficiency, I'm more inclined to blame nutrient lockout, due nute excess. Either way, not much you can do now, calcium deficiency exists weeks before the spots appear on the leaves. Lower your nute strength. Good luck mate