Help !!

[Nabzter]

I am thinking a calcium or magnesium def. Ph is all good. Growing in soil at around day 40.

 

[Dark Matter]

Plant looks healthy apart from that! Did you spill nutes on them by any chance?

 

[Nabzter]

I initially thought that may be the issue but unfortunately not as it is starting to affect all the plants of that strain and the rest are fine

 

[Waira]

....Nab, I see really droopy leaves, is that from being too dry, over watered, or the occasional "night droops" which is normal, just not with every plant? The symptoms have a weird mixed look of Ca and P defc.,... I'm leaning more toward Ca, but the large dead patches and more extensive yellowing are not a typical Ca defc. symptoms, fitting P defc. better; also, Ca defc. tends to affect leaves higher up, as it's an immobile nute', unlike P, which is; P defc. can present in several ways too! ...What is your pH, BTW? No big swings recently? Are you adding any Ca-Mg supplements, and what nute's are you using? ..NPK #'s, feeding frequency, dilution if any,...

 

[Nabzter]

Hi waira I'm using Ionic nutes bloom feed and stimulators etc. Feeding once a week at about half to 3 quarters strength. Ph is 6.8 last time I checked. You see the overwatering comment worries me as I am only watering like twice a week 3 times max at 1-1.5 litres in 16l pots. At this age in of plant this shouldn't cause overwatering especially in smart pots.
Mentioning the p I'm thinking maybe my cheap ass soil is hot although it has proved good with other strains.

Below is a few pics of the other strain that is doing great and seem to be way ahead-