I've been dealing with some kind of a deficiency for the past week. At first I thought it might be a magnesium deficiency, because I've put less CalMag to my feeding, but I'm not so sure about it. It also could be just a wrong pH of the coco. I only pH test my feeding water and not the runoff, so I don't really know, but I'll test the runoff asap to find out if this is the case. Anyways, I've decided to introduce FloraGro to my feeding from the next week, so that might help as well.