API Stress Zyme 118ml Biological Bacteria
API Stress Zyme is a biological filter additive containing live bacteria that improves the development of the biological filter. The build-up of organic pollution in the aquarium inhibits the growth of nitrifying bacteria. The bacteria in Stress-Zyme keep conditions in the aquarium right for the development of the biological filter by consuming harmful organic pollutants. Stress Zyme keeps the biological filter working properly by keeping the aquarium gravel and filter clean.
Each teaspoonful of Stress Zyme contains 300 million bacteria. These bacteria 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. Stress Zyme is effective in freshwater and marine aquariums.
| Specification | Value |
|---|---|
| Product Type | Biological Filter Additive |
| Active Ingredient | Live Bacteria |
| Volume | 118ml |
| Bacteria Count per Teaspoon | 300 million |
| Shelf Life | 5 years |
| Storage | Room temperature, no refrigeration required |
| Compatibility | Freshwater and marine aquariums |
FAQ
How long does it take for the bacteria in Stress Zyme to become active in the aquarium?
The bacteria in Stress Zyme are in a dormant state and become active once added to the aquarium environment. Activation typically occurs within a few days after introduction, depending on water conditions and temperature.
Can Stress Zyme be used in both freshwater and marine aquariums?
Yes, Stress Zyme is effective in both freshwater and marine aquariums.
Is refrigeration required to store Stress Zyme?
No, Stress Zyme does not require refrigeration and can be stored at room temperature.

Rachel McGrath –
I’ve used Stress Zyme in my freshwater tank for three months now. The water clarity has improved noticeably, and I no longer have to perform frequent water changes. The bacteria seem to be establishing well in the filter media.
Nicholas Roberts –
It’s a simple addition to my filter routine. After adding a teaspoon, I noticed less fish waste buildup. Works well with my established filter system and hasn’t caused any issues.
Abigail King –
My marine tank has been struggling with organic buildup. Since using Stress Zyme, the filter is running more efficiently and the water parameters have stabilized. Highly recommended for both fresh and saltwater setups.