Search  for anything...
Fritz Aquatics

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

  • Based on 2,873 reviews
Condition: New
Checking for the best price...
$14.99 Why this price?
Save $14.95 was $29.94

Buy Now, Pay Later

As low as $3 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: 12 left in stock
Fulfilled by Amazon
Arrives Saturday, Jun 27
Order within 21 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

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 Milliliters


Item Weight: 0.3 Ounces


Item Form: Liquid


Number of Packs: 1


Is Discontinued By Manufacturer ‏ : ‎ No


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: #5,326 in Pet Supplies (See Top 100 in Pet Supplies) #24 in Aquarium Water Treatments


#24 in Aquarium Water Treatments:


Customer Reviews: 4.6 4.6 out of 5 stars (3,377)


Brand Name: Fritz Aquatics


Manufacturer: Fritz Aquatics


UPC: 080531802090


Global Trade Identification Number: 90


Model Number: 80209


Manufacturer Part Number: 80209


Unit Count: 1 Count


Warranty Description: See Manufacturers Website


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


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


Liquid Volume: 473 Milliliters


Item Weight: 0.3 Ounces


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: Saturday, Jun 27

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Kept my fish alive when I might have lost them all.
Size: 32 oz
Saved my fish tank. 300 guppies lived when their tank started to leak and they were thrown into a new tank with no preparation. Started to crash and this stuff saved it ( with a lot of water changes). Easy to use. Well worth what I paid. Highly recommend.
Reviewed in the United States on April 12, 2026 by Kindle Customer
    • 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
    • Contains no ammonia / UPDATE Contains no ammonia / UPDATE
Size: 32 oz
Review Image by Dill
Review Image by Dill
My concern were the reviews that said it had “ammonia”. However, most tap water has ammonia, mine does. So I cannot test this product using tap water. Or else it would give a false positive result. Also, the smell of “rotten eggs” is a byproduct of bacteria “sulfur” - so it’s normal to smell this. For the test. I used a sample of water from an established tank that already has 0 ammonia and added FritzZyme 7 to it. Using the API ammonia liquid test, results are FritzZyme 7 does NOT contain ammonia. Looking forward to how this works on my tanks that need a fortification of BB. UPDATE: 1 week later, decided to use it on a newer tank to test its full potential and it cycled (day 1: 5/28/25 and today 6/3 final results)! Amazing! Tip, if doing IN-Fish cycle, make sure to watch any spikes in ammonia, nitrite, nirate, or PH daily. If needed do small WC, don’t mess with the substrate or filter when doing so, and let the cycle do its thing to keep your fish safe. Trust the process. This product did what it said it would do. Using it now to fortify my other tanks. ... show more
Reviewed in the United States on May 28, 2025 Reviewed in the United States on May 28, 2025 by Dill
    • This is necessary for all fish tanks. This is necessary for all fish tanks.
Size: 32 oz
Review Image by Cattastrophina
Review Image by Cattastrophina
I’ve used this on my tanks and friends’ tanks with struggling eco systems, it is WORTH IT! Soon after adding it, you start seeing the micro organisms responsible for keeping your water clean and your filter working well. I would recommend this to any aquarist as a basic need.👍
Reviewed in the United States on February 23, 2026 Reviewed in the United States on February 23, 2026 by Cattastrophina
    • 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
    • Helps keep the good bacteria count up.
Size: 1 gal
I always use when I clean filters.
Reviewed in the United States on June 1, 2026 by Otz
    • Yes!
Size: 16 oz
This product at the time I purchased is valid and effective. I started a cycle for an African Dwarf Frog and had immense success. These creatures are unknown with contradictions all over the internet. They're exceptional with sensitivity that requires work. I can attest that this product worked for me when I accompanied it with a seeded sponge filter fron an established aquarium ... show more
Reviewed in the United States on January 3, 2026 by Shelby
    • This is the GREAT stuff
Size: 64 oz
If you wanna get your fish tank bacteria this is the stuff to use.
Reviewed in the United States on May 6, 2026 by Colton Billingsley

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...