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 are scientifically proven to quickly consume ammonia and nitrite to help prevent new tank syndrome. Allows immediate addition of fish to a new freshwater or saltwater aquarium. Use when starting a new aquarium, adding new fish, changing water, changing filter media, after medicating , or whenever ammonia or nitrite are detected. Allows instant addition of fish. Limits toxic ammonia and nitrite. Helps prevent fish loss. Immediately starts aquarium cycle. Contains live, nitrifying bacteria. No refrigeration required. All natural.