Maybe a little back story?? Indoor? Outdoor? What light is on them? What nutrients are you feeding? How often? Could help in getting a more narrowed down answer.
Ok thanks for replying it's an indoor grow 8 plants i use 4 1800 watt full spectrum LEDs growing in foxfarm happy frog and foxfarm ocean forest using foxfarm big bloom and grow big but only doing light feedings every other watering. I PH my water to around 6.0 to 6.5 and my run off it around 6.8. I keep my temp 70 to 78 and humidity 40 to 50
