Are you giving them the feed intended for flowering, or still on veg? I'm very new to using GH Flora. For the plants I flipped on the 1st of this month, I'm giving 6mL of each part for the first two-three weeks to get them through stretch, then I'm going to switch to the flowering mix. I never had much luck with water-feed-water schedules. I usually ended up drastically underfeeding and having serious yellowing by the time they were done stretching. As stated above, I think they look a little K deficient, but I'm wondering if it's just from underfeeding. I'm lousy at figuring out what's wrong with plants, though.