Hi everyone i have a 1500gallon pond rectangular in shape (15×5×3 feet). It has a roof over it so its not directly exposed to the sun. In it i have 2 gars, 1 shovel nose , 1 redtail, 3 albino pacu. All the fish are above 2ft and 2yrs being the oldest fish. It so happens i cannot handle the ammonia production in the pond. I build a filter but its not able to handle the waste that the fish produce. Can anyone help me build a filter which can handle that waste. All fish are perfectly fine and eating well. Filter media ceramic rings n sponge. How many kilograms of ceramic rings do i require for 1500gallon pond.