API Stress Zyme
API® Stress Zyme contains over 300 million live bacteria per teaspoonful to consume sludge and reduce aquarium maintenance. It helps keep your aquarium clean and improves the natural aquarium cycle.
By incorporating Stress Zyme into your tank’s regular upkeep routine, you support an active biological filter, resulting in cleaner water, healthier fish, and better water quality.
This product is suitable for use in both fresh and saltwater aquariums.
| Specification | Value |
|---|---|
| Live Bacteria Per Teaspoonful | Over 300 million |
| Application | Freshwater and saltwater aquariums |
| Function | Sludge consumption, biological filtration support |
FAQ
Can Stress Zyme be used in both freshwater and saltwater tanks?
Yes, API Stress Zyme is suitable for use in both fresh and saltwater aquariums.
How often should I add Stress Zyme to my aquarium?
It is recommended to add Stress Zyme as part of your regular tank maintenance routine, typically once every 2 to 4 weeks depending on tank size and conditions.
Does Stress Zyme affect water parameters like pH or ammonia levels?
No, Stress Zyme does not alter pH or other major water parameters. It supports biological filtration without changing water chemistry.

Anna Dyer –
I’ve used Stress Zyme in my 55-gallon freshwater tank for three months. The water clarity has improved noticeably, and I see less sludge buildup. My fish seem more active and the filter runs more efficiently. Easy to add and effective.
Simon Parsons –
Works well in my saltwater tank. I add it every two weeks and have noticed a reduction in organic waste. The bacteria seem to establish quickly and maintain a steady cycle.
Chloe Forsyth –
After switching from a regular filter media to Stress Zyme, my tank has become much cleaner. I no longer need to clean the substrate as often. The fish are healthier and the water quality is stable.