"Adding worm castings=nitrates. More plants and water changes are a solution. How high are nitrates? How many plants do u currently have? Drop in on chat and we may be able to give more detailed advice once we have more information from you."
" The plants you have mentioned are all easily grown in low tech tanks. From what you've described its sounds as though your tank is already a success. I would be hesitant to "dirt" a small tank as it is messy if you decide to…"