API STRESS ZYME Freshwater and Saltwater Aquarium Cleaning Solution Contains one (1) API MARINE STRESS ZYME Saltwater Aquarium Cleaning Solution 16-Ounce Bottle Keeps saltwater and reef aquariums clean and reduces maintenance Consumes sludge to help keep gravel, live rock, sand and decorations clean Adds beneficial bacteria for a healthy aquarium Use weekly to maintain a clean, healthy aquarium