chasv77answered grow question 4 years ago If you are using quality soil, you should not be experiencing nutrient deficiencies at just 5 weeks.
Yellowing of lower leaves seems to be normal. I am dealing with this, in my C99 outdoor grow.
I remove these leaves, once yellow is the dominate shade. It is just a few leaves a week, and there is plenty of new gorgeous green leaves.
As long as she continues to grow out new GREEN leaves, I would not tinker with specific nutes to add, outside your regular feeding, IF that is what you are doing now.
Good growing!!👍