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

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About This Item

Details

  • 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.

Instructions

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Questions & Answers

6 Customer Questions

Does this product come cold packed?

Answer by Chewy • Apr 01, 2018
The item does not arrive cold packed.

How many drops do you add to a 5 gallon tank?

Answer by Chewy • May 19, 2022
You would use 12 milliliters per gallon for an initial dose, or 6 milliliters per gallon for a maintenance dose.

Will this clear the water?

Answer by Chewy • Jan 22, 2025
FritzZyme does not directly clear the water. However, using Fritzyme will help alleviate water quality issues (ammonia for example) that will lead to clearer water.

Do you only use this once for a new tank? Or do you need to do the initial dose plus so many days of a smaller dose?

Answer by Chewy • Jun 10, 2024
Normally, it is not necessary for you to put additional dosages of Fritz Zyme in your tank once the tank has cycled. Often, aquarium users place additional dosages in their tanks if they are adding new fish, are cleaning their filters or see an occasional ammonia or nitrite spike. If your aquarium is looking great and the ammonia and nitrites are at or near zero, it is not necessary to add additional product.
Reviews
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4.6
Rated 4.6 out of 5 stars
113 Ratings
Terms & Conditions

39 Customer Reviews

Rated 4 out of 5 stars
By Alma on Nov 2, 2025

The Nitrifying bateria

Used it in my po b d to restart my biological system. It has crashed. This takes time and API Quick Start worked in my indoor aquarium but so far not my pond so

Used it in my po b d to restart my biological system. It has crashed. This takes time and API Quick Start worked in my indoor aquarium but so far not my pond so I switched.

Rated 5 out of 5 stars
By Brian on Sep 28, 2025

Makes cycling and filter change a breeze.

I had a little bit each time I changed the filter. I think it helps. Keep the bacteria account really good.

I had a little bit each time I changed the filter. I think it helps. Keep the bacteria account really good.

Rated 5 out of 5 stars
By Julia on Aug 30, 2025

Great stuff

The only thing better than this is their other fritzyme product. Truly makes cycling the tank so much safer.

The only thing better than this is their other fritzyme product. Truly makes cycling the tank so much safer.

Rated 5 out of 5 stars
By Lisa on May 30, 2025

Quickly complete a dish less cycle

I use this along with ammonia drops to do a fishless cycle and have on numerous occasions been able to Cycle a tank in 12 days. Usually 12-14 days. My understanding

I use this along with ammonia drops to do a fishless cycle and have on numerous occasions been able to Cycle a tank in 12 days. Usually 12-14 days. My understanding is 14 days is the average but using this product I often can complete it faster.

Rated 1 out of 5 stars
By Kathy on Apr 17, 2025

Fritz7

The whole bottle had gone bad , I had to pour it down the drain! The order was so bad when opened up! This is the first one that I ordered from you guys that was

The whole bottle had gone bad , I had to pour it down the drain! The order was so bad when opened up! This is the first one that I ordered from you guys that was bad !

Rated 2 out of 5 stars
By Jadan on Apr 3, 2025

Never cycled my tank.

It never added any nitrates or nitrites to my aquarium after 2 to 3 weeks of using it. I followed every instruction it gave. Instead of buying this get the concentrated

It never added any nitrates or nitrites to my aquarium after 2 to 3 weeks of using it. I followed every instruction it gave. Instead of buying this get the concentrated version.

Rated 5 out of 5 stars
By Rich on Jul 31, 2025

It works when others dont

Terrific product good price

Terrific product good price

Rated 5 out of 5 stars
By Kent on Feb 3, 2025

Worked great

After putting in the Fritz I waited one day and was able to add shrimp from another tank the next day and they are still alive

After putting in the Fritz I waited one day and was able to add shrimp from another tank the next day and they are still alive

Rated 5 out of 5 stars
By Robert on Jan 15, 2025

Won’t setup another tank without this

Bought this to help maintain and establish a good amount of beneficial bacteria which is necessary for a healthy and thriving aquarium

Bought this to help maintain and establish a good amount of beneficial bacteria which is necessary for a healthy and thriving aquarium

Rated 5 out of 5 stars
By Julie on Apr 18, 2025

Always a great choice

Fritz chemicals seem to work as promised.

Fritz chemicals seem to work as promised.