1.  How often should I use FritzZyme?

After the initial dosage of FritzZyme® to seed the biofilter, additions are only needed if more animals are added to the system, the efficiency of the biofilter has been reduced by medications, or the biofilter has been disturbed (i.e. changing the media of a canister filter).

2.  What products should not be used with FritzZyme?

UV lights should not be used initially after FritzZyme® additions. This allows the bacteria to become attached so they will not be killed by the UV light. Many medications will also reduce the efficiency of the biofilter.

3.  How do I store it?

Nitrifying bacteria are delicate, they are "vegetative cells" and do not form a protective coat or "spore" as many non-nitrifying bacteria do. For this reason, Fritz-Zyme has a limited shelf life and must be protected from freezing (32°F) and over-heating (110°F). Room temperature out of direct sunlight is sufficient for storage. Ideal storage temperature is 45 to 55°F

4.  What is the shelf life of FritzZyme?

FritzZyme® has a shelf-life of 6 months; the expiration date is shown on each container. After the 6 month period, the time required for the bacteria to become fully active and begin multiplying exceeds most aquarium requirements. Always check the expiration date of the product.

5.  Does the color or smell change the effectiveness or remaining shelf life of Fritz-Zyme?

No. The smell may range from none to a very strong pungent odor and the color from a rosy red to a grayish black. We have seen the odor and color ranges mentioned above to be equally effective. The true test of the product effectiveness is its ability to convert ammonia and/or nitrite. If the product has not expires and has been handled properly it will be effective in the aquarium.

Independent Studies

California State, Texas A&M Corpus Christi, University of Nevada Las Vegas


Actual testimonials of FritzZyme users from hobbyists to professionals.

“I cannot thank you enough for producing a product which would clearly exceed the expectations of virtually anyone in this business.”

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