API Quick Start Water Conditioner is a well formulated aquarium medicine that effectively battles harmful ammonia that forms as a result of fish waste. The bacteria found in this medicine are known to rapidly eat up nitrite and ammonia that helps to arrest "new tank syndrome." You can use this product while changing tank water or when creating a new aquarium. Features: Immediately starts aquarium cycle Contains live, nitrifying bacteria All natural item No refrigeration needed Helps prevent fish loss Limits toxic ammonia and nitrite Allows instant addition of fish Includes: 1 Bottle Intended For: Aquariums Material: Liquid Size: Available in 4 oz, 8 oz and 16 oz sizes Instructions: Use when starting a new aquarium, adding new fish, changing water, changing filter media, after medicating, or whenever ammonia or nitrite are detected. Size: 16 Fl Oz.