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API Stress Zyme + 64 oz.

1 Review


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.


Package Size64 oz.
Treats up to3840 gal.
Internal Id


Non pathogenic bacterial cultures


Use API dosing cap included with bottle. To maintain a clean, healthy aquarium: add 1 tsp. (5ml) per 10 U.S. gallons weekly. For new aquariums, to help boost the biological filter: double the dose, use at start up, and for 2 additional weeks.

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Evidently does what it claims to do and am glad about that!


I've been using this regularly since 1999 and evidently it does what it claims to do for me because I always have healty fish and tanks.
<br>The price here is great too. I paid a lot more at a popular brick and mortar store because I didn't want to wait.
<br>There isn't much to do with it. Measure and put in your tank a few times every few days when first setting up and then weekly. Your fish will benefit from it. Think of it as acidolphilus for your finned friends.