API BIO-CHEM STARS POUCH, 20 COUNT

Biological media provides a habitat for the growth of huge colonies of nitrifying bacteria to create and maintain a healthy aquatic ecosystem. Nitrifying bacteria convert harmful ammonia into nitrate. This is called the nitrogen cycle, and occurs naturally in all underwater environments. Your fish will produce waste that fuels the growth of beneficial bacteria that They will form your "biological filter". These bacteria continue to grow as your aquarium ages – living on the upper layers of aquarium gravel, or in filter media such as biological media.