API Stress Zyme 16 Oz is a powerful bacterial cleaner that introduces over 300 million live bacteria per teaspoon to help break down organic sludge and reduce overall aquarium maintenance. Designed for both freshwater and saltwater aquariums, this solution supports a healthy biological filter, promotes clearer water, and enhances fish health by improving the natural nitrogen cycle. Regular use helps maintain optimal water quality and keeps your aquarium environment clean and balanced.