Help!! First time grow, leaves started turning bad during flower

i am in need of some help, I have looked online and I can’t figure this out. I am using promix to grow. Everything has been fine up to week 1-2 of flower (in week 2) the pictures are a leaf from each plant (I have 2) . I have given them fox farm big bloom thinking this was a phosphorus def but it seems they have only gotten worse. I’m thinking possibly a mag def now? I am needing some help! Posting pictures now. It’s starting from bottom up

Giving calcium at all?

hotrodharley said:

Giving calcium at all?

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Have not done any calcium, the plants were good up until now but I am reading that I wouldn’t know for 4-6 weeks if they need it..

They need it and regularly. Calcium should be available from the start of the grow. It's immobile in the plant. Unlike nitrogen and some others.

hotrodharley said:

They need it and regularly. Calcium should be available from the start of the grow. It's immobile in the plant. Unlike nitrogen and some others.

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I will add calcium today, do you think this is the problem I am seeing now?

Cooliojames said:

I will add calcium today, do you think this is the problem I am seeing now?

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Yes

By the way I suggest a foliar feeding of magnesium. Epsom salts. One tablespoon per gallon of water.