Yellowing leaves near the bottom and middle of plant

dave1012

New Member
I’m growing a northern lights autoflower in Biobizz light mix and it’s currently day 70 from sprout

I’m feeding 2l of water every 2-3 days and each contains
8ml of biobizz grow
8ml of biobizz bloom
2ml of calmag

This started a few days ago suddenly and seems to have spread.
My water PH is around 8 but i read that when growing in soil and with organic nutes then this shouldn’t be an issue
Final pic was taken in the morning and the other 2 were taken 10 mins ago
 

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