Hello, I am a hydroponics gardening beginner and came upon a problem with my chilli peppers. The leaves are damaged by some unknown disease or maybe I am doing something wrong. Could you help me identify the problem? Maybe they were overhydrated, or the nutrient solution was too strong (300ppm). Any hints or tips are really appreciated too. Thanks! Daniel

Have you checked the pH? I think it should be between 6.0 - 6.5. If its not, no matter what your ppm is, nutrients will be unvailable to your plants.