Without knowing anything about the plant, it looks like over-watering symptoms. What soil is that?What nutrients have you fed the plant and how often?What is the pH of the runoff?What is the PPM of the runoff?What grow light are you using?How far away is the grow light from the top of the plants?
Without knowing anything about the plant, it looks like over-watering symptoms. What soil is that? What nutrients have you fed the plant and how often? What is the pH of the runoff? What is the PPM of the runoff? What grow light are you using? How far away is the grow light from the top of the plants?