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Phosphorus deficiency?

Phosphorus deficiency?

Week 4 of flower, seedstockers Big bud auto, coco/castings mix, vpd 1.3. Noticed my root zone ec was really high (1100 ppm, max I feed is 800) so have given her 3 days of plain water but found some browning on a few fingers. Only on the main cola and only the very top...