Fluval Cycle Biological Enhancer, Aquarium Water Treatment, 16.9 Oz., A8351

(681 Reviews)

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$16.78

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(50000 available )

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Reviews
  • FatChupacabras

    > 3 day

    Really bad that a company that make really good products is so bad in making biological enhnancers (bacteria for the nitrogen cycle).

  • Nora Lopez

    > 3 day

    No sirve, no ayuda en nada al agua.

  • Jose Hanquier

    > 3 day

    This product did not work at all. I am doing a fishless cycle with 2 ppm ammonia and there has been no change in ammonia, no development of nitrites or nitrates.

  • Beans

    05-06-2025

    Love the measuring cup that comes with is, so I dont over use

  • Sean

    > 3 day

    Works

  • Sammimantha Renz

    > 3 day

    Tried it out on a brand new tank and additionally into a existing tank, I have been having wonderful water quality since then in both tanks. I would recommend a activated carbon filter with this product to take full advantage of the colony

  • Joseph C

    > 3 day

    Fluval makes great products !! Works well .

  • Randall

    > 3 day

    Hear me now..., believe me later... you need this now.

  • Walter Ponce

    > 3 day

    As soon as you start reading NO2, dose with this. Add your Ammonia readings and your NO2 readings daily and if they equal or are under 1ppm, dose a single dose for your size Aquarium with Seachem Prime, all the way up to 4ppm when added together in which case there would be a quadruple dose of SCPrime.. If Ammonia spikes to 2 ppm just do a 80% water change and add more fluval + SC Prime. If the Ammonia AND NO2 readings when added together equal more than 4 ppm, do a 80% water change and dose with fluval + SCPrime. if NO3 reads more than 40 ppm with no Ammonia or NO2, do a 50% water change but DO NOT ADD MORE FLUVAL. And of course, treat your tap water with SC Prime every time. ONLY add FLUVAL when there is NO@ present. Without NO2 the NO3 this product seems to add will not have anything to eat and will die off. Theres a few great videos on youtube and tutorials in groups. This has worked for me EVERY time so far.

  • Kforti1

    > 3 day

    Unfortunately this didnt work for us at all. We are trying to cycle a newly setup 55 gal saltwater tank. We used this per the directions everyday for a week (2 bottles worth) without any change in our levels (ammonia stuck at 4.0). However after one treatment of the 8.45 oz bottle of Instant Ocean Bio-Spira, I have ammonia level down to 1.0 tested 24 hours after treatment! Hoping this one does the trick!

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.

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