I have brown leaves on my weed plants. At first I thought it was a heat issue, because the plants are in my closet with no ventilation. I checked the light, it wasn't hot, not too close to the plants either. I haven't done anything to the plants except move 2 into better soil just recently. The smallest plant however I'm pretty sure is almost dead. I dropped this one when I was transplanting it . Please help me out. These are bag seed plants and I plat to be getting them outside into good soil very soon.