Fantastic! Let em grow. Don't over think it. you're right on track.
Try using a 15 or 20 gallon pot for your next run, With a bigger "battery" you will find out that you will need less, if any, liquid nutrients, teas and foliar sprays. Also, a larger volume of soil is more forgiving for someone who tends to under then over water the plants.
Most important, don't listen to me! Just kidding. Trust yourself and do your own research. The tutorials here are great.
Yellow leaves can be caused for a lot of reasons. Most often it's over/ under watering. Not nutes, especially not CalMAg.