In the tenth week, the plants needed more calcium and magnesium, which caused the leaves to turn a little yellow. They were a little short of nutrients and the pH was also rising. I flushed the garden and it came back up to 1.7 EC. I think the calcium deficiency was partly due to the poor pH, as the EC was only around 1.5. I've now stripped the diseased leaves from the plants and thinned the foliage a bit so that the big leaves no longer obscure the core. We'll see what happens, but the plants are also much shapelier now. At least they're really photogenic now. You can see the white spots in the pictures, and the reason is that the plants suddenly stretched and touched the LED, so they burned out in certain spots. Also, here's something else: I accidentally broke the top of the sqxm in the middle off, and I'm not sure if it's going to stay, but anyway it's starting to get really tall and I don't really like it's shape. So it's not a tragedy.