Wow ... seems to be Mg and/or K deficiency day today with several posts on this. Your first photo looks exactly like my leaves a couple of weeks ago, and this seems to be either an Mg and/or K deficiency problem. Have you checked the pH of your soil runoff? Any Mg and Ca in your nutes? Low pH can lock out Mg in particular and cause this sort of problem. It gets worse, fast, if not corrected.