A generous amount of surface area for bateria such as LR
is the best method of nitrification. NH3
shouldn't be a problem depending on your final bioload. Given enough rock, a 1-2" sandbed and not overstocking the tank will eventually lead to NNR
and less need for water changes. No mechanical filter will help with that. Nitrification is easy, dealing with nitrates (de-nitrification) is what takes time and cannot truely be done artificially. It requires anoxic/anaerobic bacteria's which consume the nitrate and convert it to less harmful nitrogen gas and CO2
. Once the tank has had time to mature, it will eventually take care of itself but in the meantime, water changes are still the best method of reduction.