Fluval Cycle Biological Enhancer

27 reviews

Fluval Cycle helps you kick start your new aquarium's biological filtration. Best used as part of a fishless cycle, it helps develop the bacteria that will later clear your tank of ammonia, nitrates and nitrites.

Products

  • Cycle Biological Enhancer 30ml
    code: A8346 In Stock (Only 2 left!)
    £3.00
    £4.89
  • Cycle Biological Enhancer 120ml
    code: A8348 In Stock (Only 2 left!)
    £5.50
    £9.39
  • Cycle Biological Enhancer 250ml + 125ml FREE
    code: A8372 In Stock (Only 8 left!)
    £8.20
    £13.99
  • Cycle Biological Enhancer 250ml
    code: A8349 In Stock (Only 4 left!)
    £8.20
    £13.99
  • Cycle Biological Enhancer 500ml
    code: A8351 In Stock (Only 4 left!)
    £17.20
    £25.39
  • Cycle Biological Enhancer 2 litres
    code: A8352 In Stock (Only 3 left!)
    £40.00
    £69.99

Product Information

Fluval Cycle is a fast-acting aquarium supplement designed to kick start and improve the biological filtration of a fish tank. The bacteria rich formula neutralises ammonia, so it's great for new aquariums.

Fluval Cycle is a carefully selected biological water conditioner created with carefully selected strains of beneficial bacteria.

Key Features:

  • Biological Aquarium Supplement- Works together with other beneficial strains to eliminate harmful toxins such as ammonia.
  • Highly concentrated.
  • The ideal mix of beneficial bacteria to make the aquarium water purer and the environment healthy.
  • Suitable for use with both freshwater and marine aquariums.

Dosage for new aquariums:

DAY 1: 25 ml per 37.8 ltrs
DAY 2: 10 ml per 37.8 ltrs
DAY 3: 10 ml per 37.8 ltrs


  • 120 ml bottle treats up to 908 ltrs
  • 250 ml bottle treats up to 1892 ltrs
  • 500 ml bottle treats up to 3785 ltrs
  • 2 ltrs bottle treats up to 15,140 ltrs

Latest Customer Reviews

  • Rating
    Date 15/05/2019 10:05am
    Fluval Cycle Biological Enhancer 500ml
    Feefo Logo
    Does what it says on the tin
  • Rating
    Date 23/02/2019 11:02am
    Fluval Cycle Biological Enhancer 250ml + 125ml FREE
    Feefo Logo
    Works well and assists in maintaining a healthy balanced tank.
  • Rating
    Date 19/02/2019 10:02am
    Fluval Cycle Biological Enhancer 500ml
    Feefo Logo
    Slightly cheaoer than products that do the same
  • Rating
    Date 29/11/2018 09:11am
    Fluval Cycle Biological Enhancer 500ml
    Feefo Logo
    Good product, good price.
  • Rating
    Date 20/01/2018 11:01am
    Fluval Cycle 250ml
    Feefo Logo
    Another product that I use, Its really good.
  • Rating
    Date 26/02/2017 15:02pm
    Fluval Cycle 500ml
    Feefo Logo
    Again, only been using the product for a short time , but seems to be working well
  • Rating
    Date 15/02/2017 16:02pm
    Fluval Cycle 250ml
    Feefo Logo
    Presume has worked....fish seem happy in their new tank.
  • Rating
    Date 02/09/2016 13:09pm
    Fluval Cycle 500ml
    Feefo Logo
    great product, use regulary and keeps water / filter clear
  • Rating
    Date 05/08/2016 23:08pm
    Fluval Cycle 500ml
    Feefo Logo
    Geat products, recommend by swells uk, Helps maintain a healthy tank for the firt.
  • Rating
    Date 29/02/2016 17:02pm
    Fluval Cycle 250ml
    Feefo Logo
    Excellent
  • Rating
    Date 30/09/2015 07:09am
    Fluval Cycle 500ml
    Feefo Logo
    Good
  • Rating
    Date 17/08/2015 09:08am
    Fluval Cycle 250ml
    Feefo Logo
    Good
  • Rating
    Date 20/07/2015 20:07pm
    Fluval Cycle 250ml
    Feefo Logo
    As Above
  • Rating
    Date 28/01/2015 21:01pm
    Fluval Cycle 500ml
    Feefo Logo
    Reliable, regular addition to my tank after every filter cleaning. Keeps the filter working effectively.
  • Rating
    Date 26/01/2015 17:01pm
    Fluval Cycle 500ml
    Feefo Logo
    product o.k
  • Rating
    Date 23/12/2014 16:12pm
    Fluval Cycle 250ml
    Feefo Logo
    well priced & packed
  • Rating
    Date 18/12/2014 00:12am
    Fluval Cycle 250ml
    Feefo Logo
    Have used this for many years - was previously know as Nutrafin Cycle.
  • Rating
    Date 15/11/2014 22:11pm
    Fluval Cycle 500ml
    Feefo Logo
    Great product keeps our fish healthy
  • Rating
    Date 14/11/2014 18:11pm
    Fluval Cycle 250ml
    Feefo Logo
    Great product