help mi guys. yellow leaves

You have 3 issues here: 1 - overwatering 2 - nutrient deficiency (NPKs) 3 - ph/chlorination I use city tap water but I boil all my water and let it sit overnight. This basically distils the water. PH down to 5.5-6.5. Most tap water will test at 8 or so without adjustments. Nutrients and soil are important. I use Sungro Professional Growing Medium. Cost is good, it’s soilless, and ph neutral. As for nutrients, talk to your local hydroponics store. I use Green Planet Nutrients 2 part system, and I follow the feed chart religiously. I’ve tried Green Goddess but found they burned my plants and led to a magnesium deficiency. Watch your watering. Too much is really, really bad. Good rule of thumb is a gallon weighs 10 pounds. Dry plants are easy to pick up. 1 gal / 5 gal pail, as needed will ensure just the right amount. Hope this helps Good luck!