Yeah try and get some pics with normal lighting.

Since you just transplanted from dixie cups to 3 gals they aren't rootbound and should have plenty of lime left, but I guess it really depends on how much lime you put there in the first place. Maybe in the meantime you can make another soil mix and test the run-off.

About your ph testing, do you have a digital pen or color coded strips/drops? If the water you test has any color it can throw off the test results.

Based on your last reply I still think it's light bleaching, but will wait for the pics when you get a chance. I don't see how switching to 12/12 had anything to do with it.
bigtopsfinn Reviewed by bigtopsfinn on . top leaves yellow/includes troubleshooting form What is your experience level? (first timer, novice, experienced...) FIRST TIME Your Equipment: .1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's) 600W hps .2) Distance from tops? 18-24 INCHES .3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...)COOL TUBE .4) Is there a consistent fresh air supply? YES BUT NOT THE FRESHEST:( .5) Do you have an exhaust fan and a circulation fan?YES .6) What are the bulb wattages, kelvin ratings, and Rating: 5