Not sure what Deficiency this is?

[Njar]

Not sure if this is calmag deficiency.
It’s a GG4 in week 6 of flower.
Giving it fox farm trio and 5ml per gal of cal mag. Watering with RO water. PH is around 6.3
Also there are 2 other strains in tent and they are fine.

[Floweringking]

Me and my partner are dealing with almost the same thing our plants were cranking then spots on our leaves and wam within a week loss of leaves and dieing bottom branches out of nowhere anyone delt with thisbefore

[Lucky79]

Sometimes called “yellow leaf spot” or “leaf septoria,” this condition is caused by a fungus (or sometimes a bacteria) that attacks cannabis plants and usually appears in warm, wet weather. Cheers