Keep your aquarium clean and water levels stable with API Stress Zyme+. Boasting 100 million live bacteria per teaspoonful, Stress Zyme+ improves the development of the biological filter and breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning. It eliminates sludge build-up, keeping your aquarium balanced and preventing low pH and low oxygen levels. Stress Zyme+ is safe for both freshwater and saltwater tanks, and helps maintain the water quality for longer periods of time, making your aquarium easier to care for. Use it any time you add new water or new fish to your aquarium. Just 5 milliliters a week will treat 10 gallons of water, making this an efficient and economical way to keep your tank clean and free from negative water quality issues.