greetings This is my first grow all organic no till. My plants are about 3 weeks from seed in solo cups, using “buildasoil” soil version 1(basically coots mix) along with the buildasoil complete bundle with the organic food and feeding schedule. I added root inoculate a tiny bit of yucca and aloe Vera flakes to my water feed from the very beginning, along with a negligible amount of nitrogen 2 of weeks later . I started off watering every 3-5 days and progressively more often up until one every two-3 now or until it’s dry at the top and bottom. I’m sure that over and/or underwatering isn’t the problem. My cups have plenty of drainiage at the bottom and the roots are super white and healthy looking. I made a 1 gallon solution to water it with and every time I water my plant, I feed it that. I haven’t fed it plain water once since seed. So there’s maybe a quart left. 2 days ago, my plants started dropping and rapidly growing brown on the leaf margins starting from the outside in with yellow spots on the leaves starting from the botttom and gradually spreading up the plant slowly. I’m using a 600 watt Cree cxb 3590 at around 50 percent strength in a 4x4 tent. I have pictures attached. Could anyone help me out?