API AA6957 Rena Filstar XP Bio Chem Stars 20 pk

API BIO-CHEM STARS are a biological filter media that provide a home for growing massive colonies of nitrifying bacteria to establish and maintain a healthy aquatic ecosystem. The nitrifying bacteria convert harmful ammonia into nitrate. This is called the nitrogen cycle, and it occurs naturally in all underwater environments. Your fish will produce waste, which fuels the growth of the beneficial bacteria that will comprise your “biological filter”. These bacteria continue to grow as your aquarium ages – living on the top layers of the aquarium gravel, or in filter media such as API BIO-CHEM STARS.