Ceramic Bio-Filter Media with Vast Surface Area AND Open-Flow Porosity. Designed for ammonia and nitrite removal in freshwater and marine aquariums. Use in sumps or in tanks under gravel, easy to shape to fit in tight/custom...

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Ceramic Bio-Filter Media with Vast Surface Area AND Open-Flow Porosity. Designed for ammonia and nitrite removal in freshwater and marine aquariums. Use in sumps or in tanks under gravel, easy to shape to fit in tight/custom places and filters.

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