Can’t pinpoint the deficiencies

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5 week old Metaphisto 3B and Sour Stomper. 5 gal with bottom 3rd OF and top 2/3 HF. Using Jacks 20-20-20 and Blossom. Also add 2ml CM and 2ml silica per gallon. This fade / deficiency started this week. I’m thinking underfed as I went light due to the OF at the bottom.

I’m thinking phosphorus or magnesium.

Any help pointers would be appreciated
 

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What is the water quality? I found that mixing 50/50 of my tap (deep well) and RO gives em about the right amount of calcium and magnesium with what's in the nutrients. Could be lockout. @Mañ'O'Green and a few others are pretty top notch on the nutes front.
Plus there is a copy/paste form thing you can fill out to give them more info they will need for diagnosis
 
I think there’s a like of nitrogen, which a decrease in N is needed for flowering. As well as
this your only getting yellowing leaves in the lower parts of the plant which is normal
 
They look ok to me. I am not a fan of layering soil. A cannabis tap root can grow 9 inches in 3 days so the roots are in the bottom of the pot way before you think. If the soil there is too hot the tap root can die causing the plant to be stunted or slowed.
 
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