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Bio Rings is an extremely efficient biological media due to its ability to house plenty of beneficial bacteria. It's pores are larger and more absorbent than other medias. It provides an even distribution of aerobic and anaerobic bacteria. For the same amount of space as other filtration media you can have far more bacteria growing in the filter. Every bit helps when keeping fish healthy and you will have far less problems. Great for both fish and planted aquariums.
