Hello man, thanks ;)
Yea if you let the coco coir dry too much can lead to problems, need to be always wet. It's my preferred medium to grow, cheap and functional hehe. Reacts very well to flushing too, any nut problems just flush and correct feeding. Usually, I only flush plants in the last 10 - 14 days before the harvest but If the leaves get too dark I change the nutrient solution to half dose for a couple days...