Stress Zyme Bacteria Additive

Grouped product items
8oz Stress Zyme

SKU: 250134

In stock


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16oz Stress Zyme

SKU: 250135

In stock


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1gal Stress Zyme

SKU: 250136

In stock


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API Stress Zyme is a live bacteria additive that improves the development of your aquarium’s biological filter, helping to keep it clean. Making Stress Zyme bacterial cleaner part of your tank’s regular upkeep routine assures an active biological filter, a cleaner aquarium, healthier fish, and better water quality. 


Each teaspoonful of Stress Zyme contains 300 million bacteria that are in a dormant state and become active when added to the aquarium. Stress Zyme has a five year shelf life and does not require refrigeration. May be used in both freshwater and marine aquariums.



  • Contains over 300 million live bacteria per teaspoonful
  • Breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels
  • Helps to reduce sludge, keep your aquarium clean, and improve the natural aquarium cycle
  • Acts as a biological filter to ensure healthier fish and good water quality
  • For use in both freshwater and saltwater systems
  • No refrigeration necessary


Three Available Sizes

  • 8 oz
  • 16 oz
  • 1 Gallon


Directions For Use

  • Shake well before using
  • For regular maintenance: Add 1 tsp. per 10 gallons of water weekly
  • For new aquariums: On the 1st, 7th, and 14th days add 2 teaspoonfuls (10 ml) for every 10 US gallons (40 L) of aquarium water. Thereafter, each week add 1 teaspoonful (5 ml) for every 10 gallons (40 L) of aquarium water
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