Hey guys, I'm about 3 weeks in to my first grow. I set up a little grow box using a rubbermaid 18 gallon tote. My plant is 3 weeks from seed and is supposedly some mango kush. The only problem is that the first set of true leaves are yellowing and I'm not sure why. They began yellowing very early on, maybe about after the first week. They seem to be the only leaves yellowing (besides the water leaves) and tho they've been yellow for over two weeks now, it has not interrupted new growth. Please let me know what you think.