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Fritz Aquatics

Fritz Aquatics FritzZyme 7 Live Nitrifying Bacteria Naturally Removes Amonia & Nitrite for Freshwater Fish (16-Ounce)

  • Based on 3,418 reviews
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Availability: Only 3 left in stock, order soon!
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Arrives Oct 18 – Oct 21
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Size: 16 oz


Features

  • Live Nitrifying Bacteria for Rapid Cycle: FritzZyme 7 Freshwater contains live, species-specific strains of nitrifying bacteria, proven to quickly reduce toxic ammonia and nitrite levels, significantly reducing fish loss and cycle time in new and established aquariums.
  • Versatile and Easy-to-Use: Ideal for use in both fresh and brackish water systems, FritzZyme 7 is perfect for post-maintenance applications, after water changes, aggressive cleaning, adding new livestock, or when changing filter media, ensuring a stable and healthy aquatic environment.
  • No Refrigeration Needed with One Year Shelf Life: This product is uniquely buffered for long-term stability, eliminating the need for refrigeration and offering a convenient one-year shelf life, making it a hassle-free solution for aquarium maintenance.
  • Proven Success in Aquatic Care: With over 30 years of continuous production and development, Fritz Aquatics is a leader in the industry, delivering the highest quality, viable nitrifying bacteria. This product represents years of proven success in professional and home aquariums alike.
  • Benefits Beyond Cycling: FritzZyme 7 not only accelerates the establishment of biofilters in new tanks but is also essential in reinforcing the biofilter after any system disturbance, ensuring ongoing stability and health for your aquatic pets.

Description

FritzZyme 7 contains specific strains of live nitrifying bacteria proven to reduce fish loss due to toxic levels of ammonia and nitrite. Nitrifying bacteria can take weeks to naturally establish colonies in new aquariums while ammonia and nitrite can reach lethal levels in only a few days. FritzZyme 7 provides the proper balance of bacteria proven to rapidly seed biofilters, greatly reducing the natural cycle time allowing for safe, immediate addition of livestock. Fritz Industries was the first company to pioneer commercial- scale cultivation of nitrifying bacteria and has remained one of only a few in the world with continuous production for over 30 years. FritzZyme 7 may be added to new tanks or established systems any time the biofilter needs fortification including: after water changes, aggressive cleaning, adding new livestock, medicating or changing filter media. FritzZyme 7 contains live freshwater-specific species of nitrifying bacteria.

Brand: Fritz Aquatics


Liquid Volume: 473 ml


Item Weight: 8.53 g


Item Form: Liquid


Number of Packs: 1


Product Dimensions ‏ : ‎ 0.02 x 0.02 x 0.02 inches; 0.3 ounces


Item model number ‏ : ‎ 80209


Department ‏ : ‎ Unisex-Adult


Date First Available ‏ : ‎ March 2, 2012


Manufacturer ‏ : ‎ Fritz Aquatics


Best Sellers Rank: #5,688 in Pet Supplies (See Top 100 in Pet Supplies) #38 in Aquarium Water Treatments


#38 in Aquarium Water Treatments:


Customer Reviews: 4.6 4.6 out of 5 stars (3,418)


Brand Name: Fritz Aquatics


Number of Packs: 1


Unit Count: 1 Count


Manufacturer: Fritz Aquatics


UPC: 080531802090


Number of Items: 1


Global Trade Identification Number: 90


Included Components: Fritz Aquatics 80209 FritzZyme 7 Nitrifying Bacteria for Fresh Water Aquariums, 16-Ounce


Item Type Name: Fritz Aquatics 80209 FritzZyme 7 Nitrifying Bacteria for Fresh Water Aquariums, 16-Ounce


Model Number: 80209


Manufacturer Part Number: 80209


Warranty Description: See Manufacturers Website


Liquid Volume: 473 ml


Item Weight: 8.53 g


Item Form: Liquid


Pet Type: Fish


Target Species: Fish


Allergen Information: Almonds Free


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 18 – Oct 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • One of the few that work
Size: 32 oz
There are many products on the market that purport to do the same thing - seed new tanks with nitrifying bacteria. I've tried at least 7 of them over the years. While I could bring in media from an established tank, I really like the idea of starting each tank fresh from scratch, so starter bacteria is in my toolkit. With each new tank (dozens over the years!), I do test daily to watch the cycle, using powdered bulk ammonia @ around 3ppm dose as the fuel source. Fritz7 is one of only 2 products that have allowed me to fully cycle in less than a week - the other being NiteOut. I've had varying levels of cycling speed with different products, from doing almost nothing over 3 weeks (Fluval!) to a 4-day full processing cycle - and Fritz is the one that got me the shortest cycle time. I've used Fritz in my last 3 tanks now, and will continue to use it at water changes, fish adds, and future new tanks! ... show more
Reviewed in the United States on August 4, 2026 by K. Samuelson
    • Helped Finish My Aquarium Cycle Much Faster
Size: 32 oz
When I first set up my aquarium, I started with Seachem Stability. However, after 2 weeks, my nitrite levels still hadn’t reached zero. I decided to switch to FritzZyme because it contains live nitrifying bacteria. After I started using it, my tank finished cycling during the third week. I honestly wish I had started my aquarium with FritzZyme from the beginning. If you’re looking for a product to help establish the nitrite cycle in a new tank, I highly recommend this one. Just make sure to follow the dosing instructions on the bottle for the best results. And ease of use. ... show more
Reviewed in the United States on July 5, 2026 by MUSTAFA G
    • Made me a believer
Size: 32 oz
This was effective for me. I did a fish-in cycle, used some lightly seeded media and gravel from another tank and then used this bacteria and dosed with Prime everyday for a few weeks. The cycle was finished pretty quick, taking about three weeks rather than the normal six or so, and I didn’t loose any fish and they all looked healthy and happy throughout. I tested my parameters regularly and had only mild spikes in levels before it colonized. I was always skeptical of bottled bacteria but this one seems to work quite well. ... show more
Reviewed in the United States on July 2, 2026 by Vanessa
    • I made a mistake!
Size: 32 oz
I made a mistake....I believed the reviews!! The review said that upon opening the bottle of FritzZyme 7 and it smells like rotten eggs or sulfur it has gone bad. So when I opened mine it smelled like rotten eggs, so what did I do? I returned it and got another. The new one smelled the same way. So on my way to return this one I stopped by Ocean State Aquatics to ask the professionals because this is what they use. They said it should smell and if i doesn't IT IS BAD!!!. So let it be a leason to you and me, do not believe everything you read in the reviews!!!! If you don't beleive me and Ocean State Aquatics read the label on the back and it will tell you the same thing!! DUH! ... show more
Reviewed in the United States on July 10, 2026 by Douglas
    • Some things to consider based on my treatment in 22L
Size: 16 oz
So much contradictory and bad information out there. Here's what I could conclude that seem consistent from various sources. The parasites are thought to be released in the water column at night. I read this after a stubborn case that was responding slowly. I changed application to evening and things were cleared up in two days. I did 24 hr interval, 30% water change, per instructions. I did it in evening. I raised temp from 76 to 79, I did not want to stress fish and plants at 86 F, sheesh. I continued for 3 days after last spots disappeared. 9 day total treatment time. I poured a dose in a white bucket and let it sit for 24 hrs. At first, water was bright blue. After 12-14 hrs it was nearly clear. Many sources claim light sensitivity. Perhaps another reason to apply at night when strength will be full and parasites are free swimming. NOTE: I don't think you can use this with Prime. Instructions say DO NOT USE WITH SULFUR OR SULFINATE BASED CONDITIONERS. Take a whiff of Prime. Smell that rotten egg? Ya. I used API water conditioner. Good luck trying to find ingredients of fish chemicals. Very frustrating (bad bad manufacturers!). It WILL definitely stain your air lines etc. I read aquarium coops blog on this, they claim to have never seen a problem. No idea how, unless they simply do not have PVC or silicon tubing. At end of treatment, mine are bright blue. I added some salt. I did 4 gallon changes based on actual water volume (not tank size) and added half teaspoon. Just enough to deal with nitrites in case of disruption of bacteria. The ich-x is claimed by some to have mild antibiotic effect. As an aside, my fish like salt. If I didn't have sensitive plants, I'd add it all the time. It prevents scale build up on tank, my fish thrive, etc. You don't need as much as they say. Salt is good. Really. I am trying to find a minimum that doesn't impact plants. Fish and plants seem ok, not 100% sure about shrimp and snails, they seem less active. I don't like the long duration required as this stuff is very toxic, however, it works. ... show more
Reviewed in the United States on May 31, 2021 by Human on the Bell Curve
    • Great product
Size: 32 oz
This stuff always works for me, especially if I have light stock in my tank. I do fish in cycles all the time and never had any issues with fish dying on me thanks to this product. You could prevent ammonia, nitrite, and nitrate spikes by adding like 4-5 small fish to your aquarium. Don’t add too many fish! More fish means more waste, which your new system won’t be able to handle. Add easy aquarium plants (Hornwort, Salvania minima, Brazilian Pennywort) as many as you can. You need plants plus this product for a successful fish in cycle! ... show more
Reviewed in the United States on June 14, 2026 by Nazmin Khanom
    • Reseña, bacterias vivas
Size: 32 oz
Buena calidad, muy útil
Reviewed in the United States on August 17, 2026 by Lisupe
    • I'm impressed! Don't wait on getting this product!
Size: 16 oz
This is my first time using this product. The reviews spoke highly of this company. I started with ghost feeding the first week, but wasn't getting as much ammonia as I wanted to begin the cycle. I got the ammonia that goes along with this bacteria in a bottle. Got the ammonia up to 4ppm 2 nights ago. Yesterday, this bottle came in, and I dosed it as recommended. This morning I did my tank parameter testing with the API Master Kit. In my cycling tank it read 2.0ppm ammonia, 0 nitrites, and 5.0ppm nitrates! It just skipped right over nitrites! That tells me this product is VERY effective! Considering it's taken me months to cycle other tanks, this is mind blowing to me. I'm glad I listened to experienced folks that using high quality ammonia and live nitrifying bacteria is FAR superior to ghost feeding. I purchased the smallest bottles they have, and I'll still have nearly all of it! Well, I guess that means I'm just going to have to get more aquariums, ha! It's so easy I'm still processing this. Don't sleep on these products, the value far exceeds their price! I'm also glad this can be used as a maintenance for established tanks. It will be a great product to have on hand to maintain a well functioning cycle. ... show more
Reviewed in the United States on August 4, 2025 by Rev. Marvel

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