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🧪 Transform your tank into a crystal-clear aquatic haven effortlessly!
API STRESS ZYME is a 16-ounce liquid aquarium cleaning solution containing over 300 million live bacteria per teaspoon that naturally consumes sludge and organic debris. Safe for both freshwater and saltwater tanks, it reduces maintenance by enhancing the biological filter and keeping gravel and decorations clean. Trusted for nearly six decades, this weekly-use formula supports a healthy, balanced aquatic environment for all fish species.



















| ASIN | B000255N3W |
| Allergen Information | Apple Free |
| Best Sellers Rank | #3,618 in Pet Supplies ( See Top 100 in Pet Supplies ) #18 in Aquarium Water Treatments |
| Brand | API |
| Brand Name | API |
| Customer Reviews | 4.8 out of 5 stars 12,087 Reviews |
| Global Trade Identification Number | 00317163160565 |
| Item Form | Liquid |
| Item Type Name | Aquarium Sludge Remover |
| Item Weight | 544.31 Grams |
| Liquid Volume | 473 Milliliters |
| Manufacturer | Mars Fishcare |
| Manufacturer Part Number | 56E |
| Model Number | 56E |
| Target Species | Fish |
| UPC | 317163160565 |
| Unit Count | 1 Count |
K**R
Great product
Works great! Simple directions and great value for the price.
S**R
10/10
Works really well with my tank keeping the water clear and helping reduce sludge on the filters which helps maintenance and keeping it running longer
M**S
Highly Recommend
Excellent Product..Thanks
A**6
Amazing product. Really works.
I use this weekly, RELIGIOUSLY. I do not miss a dose. This is my tank today, having not touched the filter in 18 months. (Fluval FX6 filled with only biohome filter media and polishing sponges.) I’ve only changed out the live plants when needed (pothos houseplant clippings) and used the magnetic algae glass scraper when needed. It’s a 75 gallon tank. I8 MONTHS!!! I highly recommend this product. Zero odor, zero nastiness.
H**I
The fish are doing well
I have been using this enzyme solution along with the API chlorine solution for about a year and seems to be working fine. The fish has survived :) It’s a little bit on pricy side.
G**O
Clear water
It works great. Keep my water crystal clear.
T**.
This really works
This really works! My plecostomoas was completely stressed out due to a faulty heater and was COMPLETELY pale in color. I started with a double dose and used it weekly and he is now over 75% back to normal color. Definitely recommend this for regular maintenance of your aquarium.
J**N
Great for my aquatic frogs
I use this religiously with my African dwarf frogs! They are still kicking strong after 3 years so it must be working!
Trustpilot
3 weeks ago
2 weeks ago