Defficency digagonsis help required !

Hi All,

Got some OG kush plants 17 days into flower and lower leaves are starting to turn yellow and the tips of other leaves are crisp.

set up as follows :

Canna nuits - A+B, Boost will add PK before flush. Also add superthrive. I have 100L bin which I add 1 cap of superthirive. Follow cannas recommendations of 40Ml of A+B and 30 ml of boost per 10 L.

Canna coco as medium in 20L pots

Feed when pots are light which is every 3-4 days which they get 8L each.

600w hps with digi ballast on superlux approx 670 w Iam told .

Fresh air in / extracted air out.

Overnight / lights on temp - 33•c which is higher than I'd like due to nice weather but hasn't been a issue through veg of first couple of weeks of flower.

I have already knocked the lights back down to 600w to loose a bit of heat get back to the desired 28•c and moved the lights up slightly.

Growth seems to be very good still so hopefully what ever is up has been detected early and shouldn't cause them too much stress.

I believe the issue is rather feed mixture maybe slightly to strong or some sort of defficency.

They are due a feed later so I was bebating adding some nitrogen or magnesium to the mixture it feed them water then start again with a weaker feed mixture.

Any help or advice much appreciated some pics below ✌

IMG_1775.PNG IMG_1778.PNG IMG_1780.PNG IMG_1783.PNG IMG_1781.PNG
 
Il also add that got the cuttings off my buddy who lives round the corner on the same water supply jst he does hydro. He has never had any issues
 
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