Your cart is empty.
Your cart is empty.
Fluval Cycle Biological Enhancer is a responsive biological aquarium supplement that ensures that all aquariums are immediately inoculated with a powerful team of beneficial bacteria, providing a safe biological habitat for your fish. These highly effective micro-organisms will create a biological flora that quickly metabolizes lethal ammonia and nitrite and allow for the immediate introduction of fish. Fluval Biological Enhancer goes to work fast, releasing massive amounts of beneficial bacteria that eliminate toxic ammonia and nitrite to establish a biologically-balanced aquarium. Fluval Biological Enhancer is strongly recommended for new aquarium set-ups and regular application will help to exclude the establishment of undesirable bacteria in aquariums.
For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.
simon bakewell
Reviewed in the United Kingdom on February 13, 2025
Use all the time quicker delivery than stated always use aquadaba company
Customer
Reviewed in the United States on August 7, 2024
As a new tank owner, I didn't realize that you needed to let the water in the tank cycle through different phases for a good week before adding fish. Given I was using bottled spring water, I though 2-3 days would be plenty. The fish looked OK for a day or two then started showing major stress signs. We lost one before I added this stuff (at the advice of the lady at the pet shop.) I thought it was too late but the fish came around by the next day. Now I add a little with every 20% water change we do. This is a must have IMHO. Amazons price was near half what the pet shop charges BTW.
Linda
Reviewed in the United States on July 12, 2024
I am cycling a new tank, and the nitrite level was very high. After trying a highly recommended Microbe-Lift NITE-OUT, the nitrite not only did not dissipate, it raised up even higher. I then went back to my "tried and true" Fluval Cycle Biological Enhancer. I drained off about 50% of the water and added Fluval to the new water in bottles for about a day. When I added this new mixture the Nitrite reading is a very pale pink. Finally some progress. I don't know who actually rates these products, but Nitrite did nothing good for my tank. I will faithfully use Fluval from now on.
KASP42715
Reviewed in the United States on June 16, 2024
This was a great addition to my tank upgrade. I went from a 55 gallon to a 90gallon, and added new dry rock and sand. This helped cycle the new stuff quickly. Corals never had an issue either.
Amanda
Reviewed in the United States on March 9, 2024
I tried the quick start for the beneficial bacteria to get my tank cycled (with tims ammonia), either was taking a long time or just wasn't enough. I started using this with water changes to get the ammonia and nitrites down once I started getting nitrates. I'm now at .25ppm of ammonia and nitrite with 10 ppm nitrate. One more partial water change and another dose of this and my 20gal tank will be ready for our axolotl. ONE WEEK AND ITS CYCLED. IM STOKED!
BK
Reviewed in the United States on October 23, 2024
Product has helped me keep my tank water safe for my fish.
DIY Mom
Reviewed in the United States on October 23, 2024
This product allowed for extraordinarily quick cycling of a new tank. Excellent! Have tested water repeatedly for ammonia – consistently testing 0 ammonia.
Joanna
Reviewed in the United States on October 14, 2024
Would give it 5 star but price keeps going up it's becoming harder to stay in. The fish hobby
KR
Reviewed in Australia on August 3, 2023
Works as intended
Isabel P.
Reviewed in Spain on August 18, 2023
Excelente, bacterias vivas que me dan muy buen resultado. Eso si, una vez abierto el bote es imprescindible guardarlo en la nevera
Juan Manuel
Reviewed in Mexico on June 23, 2020
Producto muy efectivo y recomendable
Mary
Reviewed in the United States on October 7, 2019
Just upgraded my rating to 5 stars, after tentative 4 star rating, now that the product has proven itself! HIGHLY RECOMMENDED . . . tank is crystal, crystal clear after use while adding many new fish over just a couple of days. I immediately ordered it again. This is my new "best buy" for this type of product. **Initial Review** I've used Jungle StartZyme for years, then gave Tetra SafeStartPlus a try. They have worked very well but I was shopping for a better price/larger size for "start-up" bacteria. FluvalHagen is a respected, established name and the product description read better than others I was considering so I bought this. Have only used it once but could see the difference in the tank overnight.I noticed while reading through many of the reviews on these bacterial "quick start" products that many people had negative things to say to the effect that they are useless or don't work . . . They DO Work!The short version is the tank must "cycle" to make an aquarium work properly for the fish to survive and be healthy. No amount of filtration can substitute for the natural cycle of beneficial bacteria that "eat" the fish waste & uneaten food in an aquarium. Bacteria are needed to do that. These "bacteria in a bottle" make that happen much faster, instantly for the most part.I also noticed some users were adding this before they have fish in the tank . . . bacteria and fish work together. There's no point in adding this type of product to an empty tank, the bacteria need the fish waste so they have something to eat! The fish need the bacteria so they don't get sick/die in their own waste before the cycle is balanced.A couple of **hints** for those new to fish keeping: overfeeding is the biggest problem with fish. Do Not feed more than the fish clean up within 5 minutes! It's a lot less than you think. It's fun to feed the fish but every single bit that isn't eaten immediately pollutes the tank and that's what kills the fish. Better a few small feedings than one big one. Do Not put too many fish in your tank, the "rule" is an inch of fish per gallon of water and the bigger the fish the bigger the mess! Don't add all the fish you want at once. Set the tank up, add this product, then add your first few fish. That can be done the first day, you don't have to look at an empty tank but feed very sparingly. That lets you figure out how much to feed while the filter starts to populate with bacteria. If the water stays clear, doesn't smell and the fish are doing good, then you can add a few more fish. Use this "liquid bacteria" per the instructions until you have successfully established the aquarium, then do your regular water changes as there needs to be "new water" in and "old water out, about a 3rd of the volume every month. There's no substitute for regular water changes, light feeding and live bacteria in the tank regardless of the type of fish or aquarium . . . be it a jar with a Betta or a fancy set up full of expensive exotic fish.
s.sudhakar reddy
Reviewed in India on July 30, 2015
good product....
Recommended Products
