"P" Deficiency?

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I recently got hit with something real similar,.... only effected a couple plants tho. I've settled on P Def as the problem, tho I'm not certain of the cause on those few plants.

I'm suspect of the soil tho, FF had a bad batch of soil that was released, had fungus gnats in it,... I'm wondering if it was P deficient as well, because the problem hit just a few plants that went into dirt from the same bag 2 bags ago. :wtf: