Yesterday I noticed this happening on 2 leaves of one of my plants. Sorry the picture's are so bad : ( but it looks like the tips of the leaf are burnt. It's only on two leaves on the entire plant. I'm growing in soil, under CFLs. The plants are 3 1/2 weeks old today. I haven't given them any nutes, and they've (unfortunately) been in Miracle Gro Organic Potting Soil. If anyone knows what is causing this please let me know. Thanks.