Wilted leaves serious problem

Your setup with the Umatek Zeus 1000W Pro, stable watering, and pH within the appropriate range sounds well-tailored for plant growth. However, if you're experiencing issues like yellowing leaves and red stems, it might be worth considering the light intensity. Decreasing the light intensity to 75% could be a good experiment. Cannabis plants can be sensitive to intense light, and symptoms like leaf discoloration can sometimes be a response to excessive light. Here's what you can do: Gradual Adjustment: If you decide to lower the intensity, do it gradually. Sudden changes in light intensity can stress the plants. Start by reducing it to 90% for a few days, then 80%, and so on until you reach the desired intensity. Observe Plant Response: Keep a close eye on how the plants respond to the changes in light. If they start showing signs of improvement, you've likely identified the issue. Consider the Stage of Growth: Different stages of plant growth require different light intensities. For flowering, you might not need the full 100% intensity, especially if your plants are showing signs of stress. Check Temperature: High light intensity can sometimes elevate the temperature in the grow area. Ensure that the temperature is within the optimal range for your plants. Adjusting the light intensity is a valid troubleshooting step. Give it a try and see how your plants respond. If the symptoms persist or worsen, there may be other factors at play, and further investigation would be needed.