I have Changed the water. I've set PH to 5.8. I have added the nutrients to get EC about 650mS/cm. Two of them are going great but I have a problem with one. The "triple G's" leaves looks like have been burned by overdose the nutrient. It's wierd because the other gets the same dose. After that I've set EC to 500.After that I started using RO Water i realised that you don't have to use so much nutrient as in hard water. Will see what happens. Any advice?