I have a couple seedlings, all from the same variety, turning yellow while the others seem to be doing well. Could this be bacteria or some type of disease? I just recovered from losing about 10-15(I lost count:-/) 1 month old plants due to an out break of what seemed to be leaf spot, and so I'm nervous about keeping anymore sick plants around the healthy ones. I gave these fellas some magnesium twice in the past week and they seem to only be getting worse. Any ideas?