Copper issue but not copper?

Ive got a plant white og, that has a single leaf showi g classic signs of copper deficiency. Yellow border green veins.

Water and soil rock solid 6.8ph. Im using tap water dechlorinated with potassium bisulfite. They are in happy frog week 4. No other signs on other plants.

What else could it be? Anything else present this way?

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Would love to help…
Can you post some pics?
Is it on new growth?

I cant sorry, wasnt thinking. It was a single leaf and i was doing lst and trimmed it. It just bugged me cause it def looks like your pic but nearly impossible because the ph is good and there is plenty of copper in my tap water. If it continues ill put up a pic and tag ya. Thanks!

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