Leaves turn yellow at the bottom.

autoflowers do not need a light change so you can go with your light/dark config all the way through growth and flowering
 
I can see from the pictures that your pots are very small, so yes, they may need to be watered very often. But I can't see the color of the true color leaves with the lights on. Please take some pictures under natural light so we can see their real color. Five weeks old is a bit early to give PK13.14 unless there is a deficiency.
 
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