What deficiency is yellow vein on green leaf

Post a photo?

And as always it's great to have all the info about soil, fertilizer, etc. etc.
Theres to much to list .. Lol.
Been haveing issues for few weeks thought it was russets.
420-magazine-mobile1762115178.jpg

The leafs are pointing down n curling under same with new growth so i flushed it an now the vains r yellow on the leafs
 
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