Very confusing run, all plants have been given the same feeding schedule, the same environment. And half seem to be thriving while the other half are looking a little sick. Temp has been 75F to 82F with the RH at 55-65. Running ROI E680 LEDs at 50% 3 ft away from seedlings. Water is RO and at 6.5 PH. Any tips would be greatly appreciated have a good day.