Thanks for the help guys! After looking around it probably is N deficiency. I need to get another PH test kit.
Do the plants look the right size for a month into flower?
Well I think I'm going to get rid of the Kandy Kush. They are just getting taken over by the powdery mildew. The other two strains seem to be pretty immune to it. Only 1-2 leaves are affected every day. Will get a picture up soon
Darn, I searched Kandy Kush and stopped by to check this out!
It looks like youre getting close to harvest, but the leaf yellowing looks like it could be an iron deficiency. Ph might be a problem, usually if its too high a lockout of some essentials occurs.