Of coarse your ph is good I'm assuming so....how's that cal mag? Of coarse this looks like a deficiency. But from a nutrient lock up due to calmag or due to a low ec. I run the same food all the time. So if I saw this I would wonder if my calmag was up to par and that the ph isn't to high to block out the calmag or nutrient. You will see something like this in early signs of being root bound.... but that's definitely not it lol