leafs

Hi :) This is a auto plant of my friend. He's growing Hydro. He had last grown weed 2 decades ago, photos. He sent me some pics and his leaves don't look that healthy to me. What do you think? Temperature: 24C, 75,2F RH: 60% Medium: hydroponic Npk 6,7 / 7,0 / 10,5 EC 2,2 Water: rain water, pH...