Item Type: Aquarium Ceramic Rings_x000D_ Material: Ceramic Ring_x000D_ Use: Aquarium and Fish Tank Filtration Media_x000D_ There is 0-5g/0-0.2oz Error 1Probiotics: Aquarium filter media contains extra clean, high performance live bacteria, which multiply the beneficial bacteria in the shortest possible time. 2Reduce Harmful Bacteria: Aquarium bio ceramic rings rapidly break down harmful chemicals such as ammonia and nitrite; reducing the production of moss, algae and germs. 3Improve Water Quality: Aquarium biological filter media strengthens the fish's immune system, accelerates ecological balance and creates excellent water clarity. 4Essential Fish Tank Filter Media: Fish tank bio ceramic rings are essential for fish tanks as they produce high densities of aerobic and anaerobic nitrifying bacteria. 5Unique Shape: Aquarium filter media' hollow shape enhances the filtering capacity of the media, allowing water to pass through and not be easily blocked.1 Bag x Aquarium Ceramic Rings