CR-S JBJ Ceramic Bio Rings - Small
Ceramic Bio Rings - Small (1 lb). For use with freshwater and saltwater aquariums. Keep your fish happy and healthy with ceramic bio rings. The porous surface fosters beneficial bacteria which eliminates nitrites, ammonia, and other harmful chemicals in your aquarium. It is recommended that you do not replace your bio rings and sponge at the same time, or else you will lose too much good microbes.