JUWEL Filter Media NitraxJUWEL Nitrax reduces nitrate levels in your aquarium, leading to a considerable reduction in algae growth. Nitrax is a biological filter on the containing specialist microorganisms to break down poisonous metabolites (ammonium nitrite) in your aquarium, thus reducing the danger of fish mortality. Nitrax also reduces algae growth by anaerobically breaking down nitrate, thus supporting the vitality of your fish. Characteristics of JUWEL Nitrax: Reduces