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

This is the best product out there to cycle a new tank or for increased ammonia. I learned from experience wasting my money on the rest. Everything else is garbage. Start a new tank with the turbo version and use the regular for established tank spikes. The results are amazing.

I tried two other products and followed results with an API master test kit. I started a freshwater 55gal tank and began a fishless cycle (with API tap water conditioner), however I wanted to speed up the process with a starter product.I first tried Petco's Imagitarium Biological Booster product at the recommended starter dose. After one week using Dr. Tim's ammonia to start the cycle I was at 2ppm ammonia, 0ppm nitrite and 0ppm nitrate. I tried a second starter dose, again after a week (now 2 total weeks in) I was at 2ppm ammonia, still 0ppm nitrite and 0ppm nitrate.Second, I tried API's Quick Start product at the beginning of week 3. At the end of week 3, you guessed it, 2ppm ammonia, 0ppm nitrite, 0ppm nitrate. I did not attempt a second dose of API Quick Start. I was beginning to lose faith in the idea of "quick start products".After being frustrated by the previous two, I gave FritzZyme 7 a shot based on positive YouTube review content. I added the full 16oz bottle to my 55gal tank. The very next day I began to see trace nitrite readings (well under .25, most likely .125 or so). Within two days after that I saw ammonia begin to recede, and nitrite to continue to rise by about .125 daily until it hit .5ppm nitrite by the end of day 4. By the end of the week (now 4 total weeks in) I have 0ppm ammonia, barely traceable amount of nitrite and 5-7.5ppm of nitrate!This product works, and works fast. It is no more expensive than the others at the box stores. Don't waste your money on those, buy this and get a cycled tank faster!

This is a game changer, this really helped me out in starting my 2 tanks (5 and 10 gallon), it helped stabilize it while I was running it with fish inside, adding a bit of it every water change kept my fish happy and helped with the establishment of the beneficial bacteria needed to keep the ammonia, nitrate, and nitrite levels down. It does give off a bit of odor but it manageable, it lasted my quite a long time (I put mine in the fridge). Definitely a great deal getting this size for its price point.

I bought this product after seeing multiple reviews outside of Amazon saying that this product worked very well to start an aquarium with fish instantly. I confirm it works this way!! I had an emergency to relocate 10 white cloud mountain minnows cramped in a 5 gallons who were fighting too much. So I bought a 10 gallons and filled it with remineralized RO water, I did not even had a filter for this new tank, so I tossed a filter sponge, a bit of drift wood and a USB water pump just like that. Then I poured the recommended dose for a new 10 gallons tank and I did no see any alarming ammonia or nitrite spike, only once in 2 weeks had I have to change the water due to a minor spike and it has been a month now that the 10 gallon is up a running (with a filter, substrate and plants now). I did not lose a single fish. I highly recommend this product.

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...

I have 4 tanks, had an outbreak that required antibiotics on all of them. I figured it's a good time to test the different water treatments and instant cycling. This product is amazing. It far exceeded seachem, API, and x-treme. I love all those brands, but if you ever have ammonia outbreak or need to cycle, this is your product! Easy to use, 1 bottle was used for my 90 gallon, no algae blooms- cleaned up ammonia and kept water clear.

Works well on ammonia.

I recommend reading the website FAQs on this product. I ordered this in summer, got it next day, bottle smelled like death! They did replace it the next day. However on the site a smell earthy or stinky does not matter. I added it to tank and water does not stink, change water color, or harm fish!Important to know that product should be used with a simple chlorine and chloramine remover/water conditioner NOT a ammonia remover. Product should also NOT be used with a growing plant light or UV sterilizer above 20 Watts as this will begin to kill the bacteria in the water. Simply turn your light at an angle for the next 5 days. Use only when you are testing for high total ammonia or Nitrites. This is the fastest and most recommended product on most fish keeping sights and don’t let the smell put you off. Company will send you a new one however if you do not trust it.