check this out: http://www.drugs-forum.com/growfaq/97.htm

Quote: "Nutrient Solution Burn:
There's a good chance that this leaf was subjected to nutrient solution burn. These symptoms are seen when the EC concentration of hydroponic solutions is too high. These symptoms also appear when strong nutrient solution is splashed onto the leaves under hot HID lamps, causing the leaves to burn under the solution."...." Back off the concentration of the nutrient solution just a touch, and the problem should disappear. Note that if the plants never get any worse than this leaf (figure 3), then the plants are probably just fine" End Quote.
I'm new so I hope that helps! S
Bree1978 Reviewed by Bree1978 on . 2nd grow: ITS A GIRL! Well, my last grow ended up in a male, so this time i planted two seeds in order to better my chances of a girl. And now after 18 days (i think) i now have a girl! I should mention that i am growing lowryders. And my other plant is looking to be a girl as well, but i need another day or two to be absolutely sure. my grow: 2 seeds in 2 gallon pots. Fox farm Ocean Forest soil. CFLs. in my closet. Temps are consistently around 78-83F, humidity around 40-50%. I have a fan ocillating on Rating: 5