You will get better yield with hydro as long as you keep ideal conditions....sometimes my plants get those curled leafs under the canopy and look slightly yellow......but it's no big deal,if start discoloring, start falling off,and starts working upwards,then it's is a deficiency or excess depending on symptom.....but they really look fine.got low yeild in soil ph was off ppm were off switching 2 hydro got meter so my ph n ppm r close n everything looks ok hoping 4 better results phazeing out mothers had in soil their 4 weeks flower my hydro is about 1 week going into week 2