The aquarium filter has to be one of the most important technical products to ensure an aquarium functions properly. It has the task of filtering cloudiness out of the aquarium water, providing useful bacteria with a place to settle so that they can break down dangerous nitrogenous substances such as ammonium, nitrite and nitrate, and it provides space for problem-solving special filter material. Up to an aquarium size of 200 litres, you can choose between internal and external filters. Above 200 litres, external filters are the right choice. If you are at the upper end of the filter size recommendation, always choose one filter size up, as you will then have longer cleaning intervals and the larger filter volume (not the pump capacity!) will ensure better aquarium water quality. Always place the water output of your filter in your aquarium in such a way that it GENTLY moves the surface of your aquarium water. Too much water surface movement will expel too much plant-promoting CO2 from your water and too little water surface movement will reduce the oxygen content of the water
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