FRITZ AQUATICS Fritz Zyme 7 Freshwater Nitrifying Bacteria for Aquariums, 32-oz bottle -

Fritz Aquatics Fritz Zyme 7 Freshwater Nitrifying Bacteria for Aquariums

By Fritz Aquatics
Rated 4.5 out of 5 stars

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$16.64Chewy Price

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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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Questions & Answers

2 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.

ReviewsWrite a Review

Rated 4.5 out of 5 stars
12 Ratings
Would recommend to a friend

12 Customer Reviews

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 Kortty 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 Mmc1738 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.

Rated 5 out of 5 stars
By saphbettas on May 19, 2022

The Best Bottled Bacteria

My aquarium went unestablished for months, but only after using this product has the cycling process finally kickstarted! It works perfectly, and Chewy's customer service was also extremely quick and helpful. I'll definitely be purchasing again.

Rated 5 out of 5 stars
By Zach on Jan 21, 2022

The best Beneficial Bacteria there is

This is the best Beneficial Bacteria I've tried. I had a 60 Gallon tank that I tried to cycle using Tetra Safe Start Plus, and Stability. Both of which I had success with in the past, but no matter what the Tank wouldn't cycle. I bought FritzZyme 7 Nitrifying Bacteria after it was recommended to me that this was the only Beneficial Bacteria in a Bottle that had actual live Nitrifying Bacteria that would cycle my Tank. So I tried it, and my Tank cycled within a week. I am very happy with this product, and I would definitely recommend it.

Rated 5 out of 5 stars
By Happy on Jan 21, 2022

Well pleased

I order all of my products from chewy.. always well pleased with the fast shipping great prices.. amazing customer service. This stuff is great I would recommend this product for anyone who has a fish aquarium..

Rated 5 out of 5 stars
By PetOwner on Feb 1, 2022

Good Stuff

After using this once on a brand new tank I’m sold. The tank looks awesome and now I use this for every water change and livestock additions. Must have in my opinion.