API STRESS ZYME Freshwater and Saltwater Aquarium Cleaning Solution 1-Ounce Bottle Contains one (1) API STRESS ZYME Freshwater and Saltwater Aquarium Cleaning Solution 1-Ounce Bottle Keeps freshwater and saltwater aquariums clean and reduces maintenance Consumes sludge to help keep gravel and decorations clean Adds beneficial bacteria for a healthy aquarium Use weekly to maintain a clean, healthy aquarium