The plant's doing well now. That one leaf is still a bit blotchy but the plant is in the stretch and bud sites are popping up all over, no more leaves have become effected and all the new growth looks good.
The other plant started to show classic signs(I think) of nitrogen fert burn with yellowing leaves starting at the tips. So I think over ferting had something to do with the spots even though I don't know why it would be manifested as these light brownish spots.

But both plants seem to be doing really well, they are growing like crazy on about the 11th or 12th day flowering, except for the fact that I broke the main shoot! http://boards.cannabis.com/plant-pro...in-branch.html
YxXXxY Reviewed by YxXXxY on . Light brown spots on fan leaves Hi. I have a plant that's somewhere in its 5th week, the first week of flowering. I just started noticing some light brown spots on some of the fan leaves. The plant is a really short and dense plant. I don't mean short like it looks stunted, I mean the nodes are really close together. I've looked at some of the plant problem photos that I found somewhere else, it doesn't look too much like any of them. It's in a pretty small pot so maybe being root bound can cause this? I gave it a big Rating: 5