Fritz Aquatics Fritz Zyme 7 Freshwater Nitrifying Bacteria for Aquariums

By Fritz Aquatics
Rated 4.1875 out of 5 stars


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About This Item


  • Formulated to immediately work to remove ammonia and nitrite with fast-acting nitrifying bacteria.
  • Made for freshwater tanks and reduces cycle time so you can add fish without having to wait.
  • The natural bacteria “move in” to your biofilters to establish colonies to keep your tank healthy, and won’t harm invertebrates.
  • Prevents new tank syndrome and can be used in established tanks, after water changes, adding medications or introducing new fish.
  • Available in 8-oz, 16-oz and 32-oz bottles to suit your needs and aquarium size.

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Frequently Bought Together

This Item – Fritz Aquatics Fritz Zyme 7 Freshwater Nitrifying Bacteria for Aquariums, 16-oz bottle
Rated 4.1875 out of 5 stars
$12.49Chewy Price

Save Extra 50% with First Autoship

Fritz Aquatics Fritz Zyme 9 Saltwater Nitrifying Bacteria for Aquariums, 32-oz bottle
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Fritz FritzZyme Trace Aquarium Water Treatment, 16-oz bottle
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Total Price: $41.48

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Fish TypeTropical FreshwaterBetta, Bottom Feeder, Cichlid, Discus, Goldfish, Tropical FreshwaterTropical FreshwaterBetta, Bottom Feeder, Cichlid...Marine Fish, Tropical Freshwater
Aquarium TypeFreshwaterFreshwaterFreshwaterSaltwater, FreshwaterSaltwater, Freshwater
Health FeatureImmune Support
Top IngredientsPurified Water, Proprietary Consortium Of Nitrifying Bacteria, including various strains of Nitrosomonas and Nitrospira....

Questions & Answers

4 Customer Questions

Does this product come cold packed?
Answer by ChewyApr 01, 2018
The item does not arrive cold packed.

How many drops do you add to a 5 gallon tank?
Answer by ChewyMay 19, 2022
You would use 12 milliliters per gallon for an initial dose, or 6 milliliters per gallon for a maintenance dose.

Does this have any type of salt or sodium as one of its ingredients?
Answer by ChewyAug 29, 2023
There are minimum amounts of sodium.

Can I use this for my axolotls?
Answer by ChewyJun 10, 2023
This product is made for freshwater tanks and would be safe for use with all species, including plants and invertebrates.

ReviewsWrite a Review

Rated 4.1875 out of 5 stars
16 Ratings
Would recommend to a friend

16 Customer Reviews

Rated 1 out of 5 stars
By KR on Sep 5, 2023

absolutely foul

I took the lid of this and started retching due to the most foul odor. I was not about to put something this putrid into my new fish tank. When I poured it into the toilet, this slimy debris oozed out of the bottle....absolutely nasty

Rated 5 out of 5 stars
By Billy on Nov 9, 2023

Fritz Zyme

The first time I used this product i was highly impressed with the way it cleared the water and smell.

Rated 2 out of 5 stars
By Cici on Jun 17, 2023


First Of All Chewy customer service is amazing.. they sent a new one right over but the one I was sent was pink in color and had a strong sulfur smell like it had gone bad. I tested for ammonia 4parts water and a few drops of the zyme 7.. definitely high in ammonia and you don’t want that in your tank. Bad bottle

Rated 5 out of 5 stars
By Kristin on Jun 23, 2023


Since using this product alongside other products, I’ve noticed a lot of improvement in my water quality. I’ve always maintained my tank well. but this product makes it a lot easier to maintain.

Rated 1 out of 5 stars
By jiwell on May 7, 2023

I think this is about to expired

I just received this today and it’s about to expired month. I know it’s best before 06/08/23 but i dont want to risk my aquarium.

Rated 5 out of 5 stars
By Bud on May 3, 2023

This is the best Product I’ve ever used, everyone should have this in there cabinet!!

Rated 3 out of 5 stars
By Kourtney on Nov 17, 2022

Product is ok

This product was highly recommended that it should reduce the ammonia in your aquarium in a fairly short amount of time. Well, it didn't. Getting aquarium water parameters just right takes time and the answer is not found instantly in a bottle. I was under the wrong impression that it would do just this and in fact, it takes time.

Rated 5 out of 5 stars
By ladysue on Nov 19, 2022

Fastest way to cycle a fish tank

I used this product when introducing a fish to a new tank and was amazed that in two days the parameters of ammonia, nitrite, and nitrate were all down to acceptable levels. Really beats the lengthy process of the natural way which takes two weeks.

Rated 5 out of 5 stars
By Vince on Sep 10, 2022


This is my go to when ever I do water treatments and am about to purchase four bottles so I won't have to worry about purchasing more anytime soon. It cured my ammonia spike, along with the water changes that needed to happen. Without this product I believe that I would have lost all 6 of my fish.

Rated 5 out of 5 stars
By Meg on Oct 22, 2022

Great product!

I am new to aquarium life and added fish in before cycling the tank. This product helped create a better environment for my fish and prevent fish loss.