Live, Nitrifying Bacteria To Immediately Start The Aquariums Nitrate Cycle. Allows Instant Addition Of Fish. Contains one (1) API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 30 ml Bottle Allows instant addition of fish when starting a new aquarium Reduces compounds harmful to fish when used routinely Helps prevent fish loss in freshwater and saltwater aquariums Use when starting a new aquarium, when adding new fish and when changing water and filter media