STRESS ZYME™
API® STRESS ZYME bacterial cleaner contains over 300 million live bacteria per teaspoonful to consume sludge and reduce aquarium maintenance, keeping your aquarium clean and improving the natural aquarium cycle. Making STRESS ZYME bacterial cleaner part of your tank’s regular upkeep routine assures an active biological filter, a cleaner aquarium, healthier fish, and good water quality. This product may be used in both fresh and saltwater aquarium.
Add 1 tsp. per 10 gallons of water weekly.
| Usage | Add 1 teaspoon per 10 gallons of water weekly |
|---|---|
| Application | Both freshwater and saltwater aquariums |
| Active Ingredient | Over 300 million live bacteria per teaspoonful |
FAQ
Can STRESS ZYME be used in a new aquarium setup?
Yes, STRESS ZYME can be used in new aquariums to help establish a healthy biological filter.
How long does it take to see results after adding STRESS ZYME?
Results may vary, but users typically notice improved water clarity and reduced sludge within a few weeks of consistent use.
Is STRESS ZYME safe for fish?
Yes, STRESS ZYME is safe for fish and is designed to work naturally within the aquarium ecosystem.

Virginia Wright –
I’ve used STRESS ZYME for three months now and my tank is noticeably cleaner. The water clarity has improved and my fish seem more active. I add one teaspoon weekly and it’s easy to incorporate into my routine.
Melanie Lawrence –
It works well in my saltwater tank. I noticed less sludge buildup after a few weeks. The instructions are clear and the product is easy to use.
Sam Lyman –
My freshwater tank has been much easier to maintain since I started using STRESS ZYME. The bacteria help break down waste naturally, and the water quality is better overall.