In a new aquarium, harmful ammonia and nitrite build up from fish waste, often resulting in fish loss or “new tank syndrome”. The unique, patented nitrifying bacteria in API QUICK START Saltwater And Reef Aquarium Nitrifying Bacteria are scientifically proven to quickly consume ammonia and nitrite to help prevent fish loss. API QUICK START Aquarium Treatment allows immediate addition of fish to a new freshwater or saltwater aquarium as it immediately starts the aquarium cycle. This treatment also helps to maintain an active biological filter in an established aquarium for healthy water conditions. API QUICK START contains live, nitrifying bacteria.