Hey momma, I love your motherly instincts and passion.
Sorry to hear all the chirps about things other than your question.
I am looking at your nighttime temps. 59 degrees. whoowee thats cold momma. Pests and nutrients aside, your baby is not getting proper sunlight. Also, the temp fluctuation is killing you. Plants kill of leaves they don't need if other parts of the plants are competing for nutrients. Google some tips on plant training. Check out my grow diary, and my week five stats. I am growing indoor but in organic soil. Your Ph. or potential hydrogen is wonderful. Perhaps you are feeding them tap water? This could overload in random nutrients, but probably not. Make sure the temp of the water is between 68-72 degrees F.
Cut off the brown leaves where the stem meets the stalk. As long as your main stalk is healthy you have hope. Like homboy said earlier about the gnats, he's spot on. Your soil, is that just regular potting soil with no amendments? This might be a problem, second, did you activate your soil? In order to have a healthy ecosystem in your soil, you need to introduce large microbes. Such microbes come from compost teas or Alaskan fish oil (from walmart. Check out Caligreen on youtube, use his compost tea mixture and feeding schedule, and you'll be poppin in no time. Keep growin momma!
like