that sure looks like a mold or fungus to me. Does it flake off? The brown spots one, looks like a mold that would flake off to me. If that's the case then I would be leaning towards humidity being the issue. If that is mold I would think you want to remove that from your grow space immediately.

The other plants look great. That sure is puzzling, when one does something and the others don't. Be careful it doesn't spread.
Prodaytrader Reviewed by Prodaytrader on . different leaf issues i looked through johnnyrex's post about his leaf issues and saw the link to that wonderful icmag forum with all the apparent plant problems, my issue is, i'm not sure which deficiency my plant has.. i have some pictures of one plant here.. the plant seems to be doing well for the most part but a few of the lower leaves are being affected and it's troubling me not knowing whats wrong. i'm just basically growing for shits and giggles. i have 2 plants, only one is really affected, the other is Rating: 5