Robertsanswered grow question 8 months ago This is a coco grow. There is no such thing as overwatering. Unless you let it sit in run off. Lack of irrigation and enough water going through is the problem. You have a salt build up,and ph is likely out of line from it. I been growing in coco for years. I bet your lh has spiked really low in coco from my experience. Test run off ph.