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 QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria are scientifically proven to quickly consume ammonia and nitrite to help prevent fish loss. QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 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. QUICK START contains live, nitrifying bacteria. With Aquarium products, it?s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, we have been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium.