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It can be related only to 2 things, ph or light intensity, from state of plant.
5.8 ph is for coco veg period, not for soil. In soil range is 6.2-6.8, best grow rate with 6.3-6.4. Adjust it asap, when you do next watering. Flush is only for coco or hydro, you dont do it with soil, if anyone tells you, dont listen.