All-natural API MARINE STRESS ZYME Saltwater Aquarium Cleaning Solution contains beneficial, live bacteria that are uniquely suited to consume sludge and keep aquariums clean. STRESS ZYME keeps glass, live rock and sand clean and boosts the natural aquarium cycle, reducing aquarium maintenance over time. STRESS ZYME breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels. Use weekly for a healthy, clean aquarium and to maintain a strong biological filter. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.