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- Promotes the reproduction of beneficial bacteria: As the ceramic ring is equipped with microscopic pores, it is suitable for the reproduction of nitrifying bacteria that inhibit the growth of other bacteria and thus reduce the risk of bacterial infections in fish. - Reduce the frequency of water changes: the use of ceramic rings effectively cleans the water and reduces bacteria in the water, reducing the frequency of water change in the aquarium and keeping the fish and plants healthy. Bio Ring Glass Available: 350g Made from natural The multi porous Best for fresh water and saltwater