I have found a liquid chelated iron and zink compound at Home Depot. I am hoping this will help improve the results in the system. Our tomatoes and peppers are small and sparse at best. There is some yellowing in the plants, but not real bad. Generally the growth is slow in all of our plants. Our seedlings start out good and then peter out. The pH is 6.4 to 6.6, NO2 is 0 ppm and the NO3 is at lea…