Cal mag def or something else ?

Since it is affecting the newer leaves, this would indicate a lack of minor nutrients, most probably iron. A dose or two of soluble trace elements, available from any garden centre, should fix this problem quite quickly and restore these leaves back to normal health. Hope this helps, Organoman.

Hi—- assuming PH is stable, this looks like a classic cal-deficiency with a touch of early nitrogen deficiency.

I always check my runoff water, to make sure ph is proper and ec is not creeping up. This tells you if your lacking food or overfeeding, causing the roots to lock out certain nutrient uptake. That tells you if your under the proper ec level and you just need to add more feed or the plants are suffering due to over feeding and they can't uptake what they need to stay healthy. So if you check your runoff and all is at proper levels then you know their really needing more cal/mg. To much cal/mg brings on problems all of it's own, so it's best to know if they actually need it or it is something else going on. Cheers

calcium you get little dots over your plants that end up going a rusty colour if un treated and the mag defics can see leaves like your 3rd pic lighter oustide vaguely and real dark inners i think yeah some cal mag mate and abit of nitro aswell as you're lacking some of that i believe.