Check out this link and look at figure 14....looks very similar to your leaves which might mean a Potassium deficiency. I am by no means knowledgeble about nutrients so draw your own conclusions.

http://www.drugs-forum.com/growfaq/97.htm
doco Reviewed by doco on . 3rd grow finnally figurin this out hey guys im on my third real grow my firs one i had it in my closet with florescents my second i had 2 400watt hetal halides in my basement for this most recent attempt i have built a room in the corner of my basement and in addition to my 2 400watt halides i purchased a 600watt hps they are about 4 weeks old in these pictures how am i doin im using 5 gallon plastic pails filled with sunshine proffesional grow mix being fed with a mix of advanced nutrients and general hydroponics flora series Rating: 5