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.