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

(681 Reviews)

Price
$16.78

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(50000 available )

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370 Ratings
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Reviews
  • Karin W. Brewer

    Greater than one week

    I am still new to the fish business but I think my fish are happy and healthy

  • PJ

    Greater than one week

    I used Fluval Cycle biological during a new 20 gallon tank fishless cycle. I did not have any seeding material from an established tank; I did buy two Java Ferns for my tank. I researched how to do the fastest fishless cycle, and here is how it went! :) Day 1: Dosed Fluval bacteria as bottle instructs Dosed 4 Drops per gallon Dr. Tim’s ammonia Added tiny bit of fish food Lowered water a few gallons to increase aeration Turned heater to 84 degrees Keep aquarium lights off the entire time Day 2: Dosed bacteria as instructed Ammonia: 2.0 Nitrites: 1.0 Day 3: Dosed bacteria as instructed Ammonia: 1.0-1.5 Nitrites: 2.0 Day 4: Ammonia: 1.0 Nitrites: 4.0-4.5 Day 5: Ammonia: .75-1.0 Nitrites: 5.0 Day 6: Did 80% water change (added Prime to new water) to lower level of nitrites in the water and bring the pH closer to neutral. The bacteria lives on the surfaces of the tank and in the filter. Too high of nitrites can stall the cycle. Added ammonia. Ammonia: .50 Nitrites: 5.0 Nitrates: 30 ppm pH: 8.2 Day 7: Added bacteria Ammonia: 2.0 Nitrites: 2.0 Day 8: Ammonia: 1.0 Nitrites: 1.5 Day 9: Added ammonia. Ammonia: 0 Nitrites: 2.0 Day 10: Added Ammonia Ammonia: .25 Nitrites: 2.0 Day 11: Added bacteria Added little ammonia Ammonia: 0 Nitrites: 2.0 Nitrates: 5.0 Ph: 8.0 Day 12: Ammonia: .25 Nitrites: 1.5 Did 80% water change and added ammonia and bacteria. Day 13: Added ammonia Ammonia: 0 Nitrites: 2.0 Day 14: Added ammonia Ammonia: 0 Nitrites: .25 (finally a big drop!!!!) Day 15: Added Ammonia Ammonia: 0 Nitrites: 0 Nitrates: 80 ppm Cycled!!!! Woo!!! Gradually Lower temp to 76. Do a large water change prior to adding fish.

  • Glam

    > 3 day

    Easy to use

  • Duck0872

    Greater than one week

    Had been trying to fishless cycle a tank for several weeks. We had tried similar products from other companies and had zero results. This was a last ditch buy and didn’t expect any results. I did the three day dosing and on the third day I had 2 ppm ammonia and 0 nitrates. 3 days later the ammonia has dropped to .5 ppm and nitrates are at 10 ppm. I had pretty much assumed all of these products were snake oil but this actually got some bacteria going.

  • Kira

    Greater than one week

    This stuff goes a long way compaired to other brands.

  • Matthew Potts

    > 3 day

    Awesome product!!

  • zzbop

    > 3 day

    I cant tell if this cycles a tank on its own but it does do something. I think it helps. I got this after I started a tank cycle and then accidentally stalled it and didnt know what to do. My ammonia was being converted to nitrites, so phase 1 was complete, but the nitrites were not being fully converted to nitrates. This lasted months with no change so I definitely stalled it. I figured out a few things I did wrong and I bought this product. As soon as I added this product to the tank, the water would start to look crystal clear. After a while of dosing this as instructed and helping the cycle in other ways, the nitrites were finally converted to nitrates and the tank was cycled.

  • Rance K.

    02-06-2025

    This great 4 your fish tank

  • pita

    > 3 day

    New Tank, seems healthy

  • Brenda N stumpy

    > 3 day

    Why cheaper then fish stores but I learned it’s cheaper to just go by the gallon

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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