It doesn't look like anything from your LED. I'm seeing yellowing, a bit of necrosis, and a little leaf droop. More likely a root or nutrient issue. I don't have enough information on the nutrient front to say specifics (and I don't use Fox farms). If the environmental conditions are good and watering is on point I would look into the nutrients. Especially if it seemed to start during flowering after a healthy veg. Happy growing! 👍🌱