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How can I fix this? By flushing? yes I keep it in between 5.5-6.0

I'm growing in coco Using cal mag from botanicare im using kelp from Remo nutrients and soil nutrients from nectar from the gods npk at 5-6-3

hey guys this is only my second grow so far so good but just started noticing this yellowing on the leaves starting from the top don't now if it's calcium or magnesium or iron. Can anyone help much appreciated