Hydor Sintered Quartz Bio-Rings For Biological Substrate , 400 gm Cat Grooming Nail Clippers Simply add additional decor and

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Hydor Sintered Quartz Bio-Rings For Biological Substrate , 400 gm Cat Grooming Nail Clippers Simply add additional decor andThe Hydor Sintered Quartz Bio Rings, 450 grams, are an ideal substrate for biological filtration. High surface area and the macroporous structure of the rings facilitates efficient growth of colonies of beneficial bacteria, both aerobic and anaerobic. Bio Rings do not release phosphates or heavy metals and do not effect pH of the aquarium. For freshwater or saltwater aquariums. PH neutral High Surface Area Easy to Use Ideal for optimal biological