I've been having trouble growing downoi for the past year. The crowns haven't been dying but they don't change in growth. I had this substrate mix with eco, flora, aquariumplants.com's black diamond. I have amazonia now and it still hasn't been growing well. I see many people growing and selling many crowns. I can barely get my crowns bigger than a quarter. I have cories and sometimes they pull it out but I plant it back after. I have co2 and does EI once in a while. What am I doing wrong?