veins

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...

Hello, I have been looking everywhere online but can't seem to find an identical issue. I am new to growing and in the last weeks I have tried 6 different seeds with same painful results. The seedling her first 2 leaves, their veins become lime green already after 3 days after coming above...