Quick Start Aquarium Cycling Starter is a 16oz bottle designed to jumpstart the nitrogen cycle in aquariums up to 470 U.S. gallons. This product from API contains beneficial bacteria that help to convert harmful ammonia and nitrite into less toxic nitrate, promoting a healthy environment for fish in all water types. The unopened 89E model ensures that the bacteria are fresh and ready to work in your aquarium, providing a quick and effective solution for maintaining clean and safe water for your aquatic pets. unopened not damaged as Described and photographed exactly No misrepresentations. Shipped carefully in a recycled box mailer secure delivery confirmed.