Why Yellow?

Was wondering why the discoloration on some of the lower leaves.Look like they are folding under and turning yellow.I just switched to 12/12 a few days ago.I have been watering every 3-4 days about a cup of water with 1tbsp of Earth Juice per gallon of water.Very mild organic nutrients.why the changing color?Do I need to water more?I am pretty sure I have not over fertilized?HELP!!!!

They are all mostly 5 weeks. To young to switch 12/12? What you mean flood with gallons worth of food?you mean flush it with reg water?

What I am saying is too mix nutes up with one gallon of water and give them a good watering/feeding. It could be that they need more food and water.

That's what I usually do every 3-4 days.didn't want to overwater. How often and how much u think I should water. Plants 12-20 inches under 2 400w lights?

when the top soil gets dry water them, and try and water 1st or 2nd hr of lights on soi they have all day 2 eat. Or lift them, if they are light they need fed.

that is exactly what I do. Maybe 2 inches til I water though. Hmmm. Am I underwatering then u think. Water usually drains out bottom from just a cup or so. Maybe I should water a day earlier? Whatcha think. Is that why they turning color?