Question:

Say I have two plants that share a common flood tray. They are both drawing from the same nutrient supply and get the same amount of everything else. Why then would one plant show signs of what I am diagnosing as a phosphorous deficiency and yet the other plant be perfectly fine? I'll get some pictures up later tonight. Thanks guys.

are these 2 the same strain (clones?)

Different seeds = different genetics

Try flushing the one that look weird & giving her a 'reset' ...

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Akums Razor-the simplest explanation is usually correct.

Its not a phosphorous deficiency.

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Because its the law of averages with plants. To get to two flowering plants that are equal performers, you needed to start with 4 - 5 veg plants which started from 6 - 7 clones which started from 10 or so cuttings. At each stage you would have culled the week ones and continued with the strong. Eventually picking the two best performers for flower.

Instead one plant is stronger than the other and is shouting to the other plant, "I drink your milk shake! I drink it up!"