Opinions?

Hey all, Not first time growing, but, first time growing in purely organic soil build. I am starting to have a few rust patches on some of the middle growth of my canopy, along with red stems. I am thinking it might be Phosphorus def. Its just weird because all of the other plants are chilling in the exact same batch soil mixture and they are good. Anyway I thought I would see whats good with y'all in the community maybe I am missing something? Thanks in advance God bless and have a nice day.

Set up: Lighting: The sun, LED (300 true watts when cloudy)
Base soil = Atami grow-mix
Amendments:
-Perlite 25%
-Seabird guano
-Fish Meal
-Bio tabs (startrex, orgatrex)
-worm castings
-eggshells
-epsom salts
soil ph 6.2
water ph 7



Photos of plants are all from this morning 5 weeks from seed (day count begins from breaking soil)
First Three photos are of the plant in question, 4th, is a comparison plant, both are same strain.
 

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