Stress Zyme improves the development of your biological filter and helps keep a naturally balanced aquarium. Contains 100 million live bacteria per teaspoonful. Continuous use of Stress Zyme assures a healthy biological filtration, good water quality and a clean aquarium.

Treats up to 3,840 gallons.

Safe for freshwater and saltwater fish, invertebrates and plants. Stress Zyme is restricted and will not be shipped to Hawaii.

Non pathogenic bacterial cultures