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

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.

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

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.

This stuff workssssss. Was having ammonia issues in the late stage of cycling and this fixed it all up in a couple days. I can’t recommend this enough. Note, watch the amount you buy because it expires. All my fish are happy campers with the ammonia being taken care of and it’s a good investment.

I replaced the substrate and planted in my established aquarium. I've owned fish for over 30 years and always just let the tank sit for about 2 weeks and cycle naturally before adding the fish back. I decided to try this product to speed up the process so that I could my fish back from their small holding tank back to the main tank as soon as possible. I was a little hesitant adding it as the solution smells terrible, but it is live bacteria! I checked the ammonia and nitrites after a few days and they seems almost where they should be, so I added the fish back. They were a little sluggish at first, but were eating and back to normal with a week. Overall, the best way to cycle a tank is still waiting...

Having trouble starting or completing the nitrogen cycle in your aquarium? Need more beneficial bacteria? Use this product, in a heavy dose. IT WORKS !

We like using this product. We've bought it several times in the past few years for our freshwater fish.

Amazing product!!! Helps keep tanks cycled when doing massive water changes or when cleaning out canister filters so you don't lose all of your beneficial bacteria! Recommend this product to all my fish keepers!

Brilliant

I emailed Fritz about some quries and their response was prompt and friendly. been using these for tanks and i do not need to add any salts or whatever. Fzz7 will stink like old eggs and a bit brownish but it is normal, not spoiled. Fritzguard is bluish and dun need it as much as Fzz7. Keep them normally in cabinet and use them every water change. Instructions are clear..

El producto llegó caducado.

I tried quite a no of other bacteria for my fish tank and found this to be the most effective. Only a small amount is needed for a stabilised tank.

Absolutely rubbish, please don’t buy this…buy gloop instead for the live bacteria…these don’t work.