Hey, guys! I'm in the middle of my 3rd grow (white widow) and I've come across a strange problem I can't find the answer to. Here are some pics I hope will help. This is the least healthy of the 3 plants. As you can see, she's got some yellowing on the lower leaves. The other two plants are a lush dark green, but they still have the spots: The spots on my plants are mostly in the middle. They don't seem to focus on the edges: Most of the spots are pale/white in the middle with a dark edge, but a few are muddy brown throughout like this: I just don't get it. It doesn't look like nute burn because that usually burns along the edges (made that mistake with my first crop) and these spots are in the middle. The spots are evenly spread throughout--they're not focusing on the top, so I don't think it's heat. (It's nice and cool in the grow room and the light isn't too close) I'm careful not to over-water or under-water (again, mistakes I figured out after my first grow). I tested the PH level with a probe that goes in wet soil and it's holding nicely at 7. The plants are getting 24 hr light; they're about 17" tall, 6 weeks old. Any clues as to what these spots would be and how to cure it? Any input is greatly appreciated!