hey man you have two main problems at the same time, first the LEDs are too close which is causing that cupping from the light stress. Second you have PH fluctuations because your PH is too low which leads to fluctuation when the soil buffers the PH up to 6.5. This make it appear like you have bugs or calcium deficiency. So what you can do is raise the leds to 12 inches and PH up the water to 6.5 or 6.0. Hope this helps my friend ! 🚀