Phosphorous, manganese, or potassium deficiency?

These are my new babies. They are chocolope.

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it’s only on the plant on the right. the other one is doing just fine… even though everything by my measurements has been exactly equal.

I wouldn’t worry about the first few set of leaves too much., but it could mean the hydroton/rockwool is too wet; water level is too high. Should be 1-2” below the net cup.