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Contains live bacteria to consume sludge and reduce aquarium maintenance


  • Keeps aquariums clean
  • Improves biological filter

Follow API Easy Care Guide and use STRESS ZYME:

  • Weekly as part of Regular Care to reduce aquarium maintenance and maintain a strong biological filter

STRESS ZYME adds beneficial bacteria to break down and consume organic matter to help keep the aquarium clean.  The bacteria in STRESS ZYME is uniquely suited to consume aquarium sludge, and keep the gravel clean.  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. These bacteria improve the development of the biological filter and help clean a dirty aquarium.  Making STRESS ZYME a part of regular care assures an active biological filter, cleaner aquarium, healthier fish and good water quality. No refrigeration necessary. For use in fresh and saltwater.

To learn more about the effects of adding Stress Zyme to your aquarium, click above on the Science Inside logo.

 Treats: 5ml treats 10 U.S. gallons of water weekly
Directions: Use the API Dosing Cap on the bottle.  Shake well.  To maintain a clean, healthy aquarium:
add 1 tsp. (5ml) per 10 U.S. gallons of water weekly. 

Keep from freezing.  Do not store above 120°F (49°C).  Keep out of reach of children.   

Item #:                                 Treats:

1oz. 56A                               Up to 60 U.S. gallons

4oz. 56C                               Up to 236 U.S. gallons

8oz. 56D                               Up to 474 U.S. gallons

16oz. 56E                             Up to 946 U.S. gallons

64oz. 56J                              Up to 3,780 U.S. gallons

1 U.S. gal. 56F                    Up to 7,600 U.S. gallons


Regular Care