i have a 240l tank how much cycle do i use in my tank it is a new tank.

Tip the whole bottle in your filter

Can this be used to boost some established bio media in a new tank?

Yes definately. Put it in the tank as instructions say. Then keep putting a min og 10 ml in until your happy. I used it for setting up new 200 ltr tank and it's the only stuff I used after that.

Can I use this in salt water?

Having read the information on the back of the bottle it says that it is safe for use in fresh and salt water aquariums.

I want to add new fish into my established tank. Can I add this into the tank, let the bag with new fish float for a while then release the fish?

No! What you must do is add this after following the instructions and leave for a few days for the bacteria to establish a proper environment for the fish before they are added. Try reading a book or 3 on setting up a fish tank.

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Fluval Cycle Water Treatment, 500 ml

Product ID: 48226688

Details

Brand
Fluval
Item form
Liquid
Item weight
0.56 Kilograms
Liquid volume
16.9 Fluid
Number of Packs
1

⚡Rapid ammonia & nitrite neutralization

🌊Treats up to 3,800L water

🦠Instant beneficial bacteria boost

€ 39.88

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Description

🦠 Transform your tank into a thriving aquatic paradise—no waiting, just winning!

INSTANT BIOLOGICAL BOOST - Kickstart your aquarium’s ecosystem from day one with powerful beneficial bacteria.
RAPID TOXIN NEUTRALIZATION - Effectively metabolizes harmful ammonia and nitrite to prevent toxic spikes.
LONG TERM WATER QUALITY SUPPORT - Regular use excludes harmful bacteria, maintaining crystal-clear, healthy water.
VERSATILE FRESH SALTWATER USE - Perfectly formulated for both freshwater and marine aquariums.
SAFE FOR IMMEDIATE FISH ADDITION - Establishes a stable habitat allowing you to add fish right away without worry.

Fluval Cycle Water Treatment is a 500 ml liquid biological enhancer that instantly inoculates aquariums with beneficial bacteria, rapidly converting toxic ammonia and nitrite. Suitable for fresh and saltwater tanks, it treats up to 3,800 liters, enabling immediate fish introduction and promoting long-term water health with regular use.

Specifications

ASIN	B00G25IAN6
Best Sellers Rank	605 in Pet Supplies ( See Top 100 in Pet Supplies ) 3 in Aquarium Water Treatments
Brand Name	Fluval
Country Of Origin	United Kingdom
Customer Reviews	4.6 4.6 out of 5 stars (6,774)
Global Trade Identification Number	00015561183512
Item Form	Liquid
Item Type Name	Cycle Biological Aquarium water treatment
Item Weight	0.56 Kilograms
Liquid Volume	16.9 Fluid Ounces
Manufacturer	Rolf C Hagen UK Ltd
Manufacturer Part Number	A8351A1
Model Number	A8351A1
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish
UPC	015561109703 015561183512
Unit Count	1 count

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€ 39.88

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Spain.

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Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

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