I am growing 3 plants, only 2 of them are mature-seedlings. The third one is newly-sprouted. But my 2 older plants (which are still seedlings) seem to have yellow tips on their first true leaves. Is it an excess of nutrients? Because i have not been putting in nutrients, the potting soil i am using already has nutrients in it. Or is it heat burn or something? Or is it a deficiency? Please help. http://i37.photobucket.com/albums/e93/shocker159/IMG_4620.jpg http://i37.photobucket.com/albums/e93/shocker159/IMG_4621.jpg http://i37.photobucket.com/albums/e93/shocker159/IMG_4624.jpg http://i37.photobucket.com/albums/e93/shocker159/IMG_4625.jpg http://i37.photobucket.com/albums/e93/shocker159/IMG_4626.jpg