Auto Bomb [BOMB SEEDS] - HELP NEEDED - LIGHT GREEN SPOTS ON FAN LEAVES

Hi All

Hope someone might know what is going on here with the light green spots which have developed on the older fan leaves. The plant has just started to show sex and I have seen these spots.

Can't be a pest issue as I have treated the plants with Canna Cure from the beginning and I have had no insects bar one fly caught on any traps.

Any help much appreciated!

Were the discolored leaves touching soil for a while?
Are you using flower or veg nutes?

Veg nutes - Canna Coco A + B - the plants are linked to one reservoir and the others are fine.

They may have been touching the soil as they are Auto Bombs which are dwarves! Could it be that?

Yep, ive had several do that when lower leaves were on soil. With it being a bottom leaf I would just trim it any other near soil off.

Can't be that - the leaves which are higher up have also the spots and now they seem to be getting yellow even!

Ok, 1 thing eliminated.
What's the ph?

I checked with a PH pen it shows 6.4 I wonder why it wouldn't affect the other plants they are from the same reservoir and genetics.

may be a calcium deficiency from what my research has pounted me to if anyone can advise. It happened all of the suddenly!

that's magnesium broskie. the margines turn yellow while the veins stay green. starts from the tips and serrations and progresses inward to veins. Calcium is copper dots and blotches. they show up all ober the leaf in no particular order. Epson salts will fis this. 1tblsp/g now and follow every feeding with 1tsp/g magnesium is a mobile element and will clear up quickly. don't worry your fine.

are you using canna coco with the a+b? if not then that's your answer. coco was poorly buffered if at all.