API Quick Start contains live, nitrifying bacteria to immediately start the aquarium cycle, allowing the instant introduction of fish to all tanks that have been set up and brought to temperature. Unlike most products of this nature, API Quick Start has a unique formula that requires no refrigeration and lasts up to 2.5years. The formula is multi-purpose and can also be used when adding fish, changing water & filter media, after medication or whenever ammonia and nitrite are detected. For use in all fresh and saltwater aquariums