Nutrafin Cycle Biological Aquarium Supplement 120mL

Nutrafin Cycle Biological Aquarium Supplement 120mL is a concentrated beneficial bacteria treatment designed to help establish and maintain biological filtration in freshwater and saltwater aquariums. Its live bacterial formula supports the natural breakdown of harmful ammonia and nitrite, helping create healthier water conditions for aquarium fish.

Ideal for starting a new aquarium, introducing additional fish or supporting your filter after maintenance, Nutrafin Cycle provides a convenient way to add beneficial bacteria when your aquarium needs them most.

The 120mL bottle is a practical size for smaller aquariums and regular maintenance, with no refrigeration required.

Why Choose Nutrafin Cycle?

• Supports aquarium cycling: Introduces beneficial bacteria to help establish the biological filtration system in new aquariums.
• Helps process ammonia and nitrite: Supports bacterial activity involved in managing harmful nitrogen waste.
• Reduces new tank syndrome risks: Helps establish the bacteria needed to support water quality in newly set up fish tanks.
• Supports existing filters: Useful after filter cleaning, water changes or other maintenance that may disturb beneficial bacteria.
• Useful when adding fish: Provides additional bacterial support when the biological load increases.
• Freshwater and saltwater compatible: Suitable for tropical fish tanks, goldfish aquariums, cichlid setups and marine aquariums.
• Bio-floc technology: Uses Nutrafin's bacterial preservation technology to support product stability and shelf life.
• Easy to store: No refrigeration required when stored according to the manufacturer's instructions.

How Does Nutrafin Cycle Work?

Fish naturally produce ammonia through their waste, while uneaten food and decomposing organic material can release additional ammonia into aquarium water. Even relatively low concentrations can be harmful to fish.

In an established aquarium, beneficial bacteria living in the filter media and on other aquarium surfaces process ammonia into nitrite and then into less toxic nitrate. This process is known as the aquarium nitrogen cycle.

Nutrafin Cycle introduces beneficial bacterial cultures to support the development and maintenance of biological filtration. Its concentrated formula helps establish bacterial populations in new aquariums and provides additional support when the existing filtration system is disturbed.

Regular use can help maintain biological activity, particularly following water changes, filter maintenance or changes in fish stocking.

Important: Nutrafin Cycle is a biological supplement, not an instant chemical ammonia remover. Beneficial bacteria still need suitable conditions and time to establish. Regular water testing remains essential.

When Should You Use Nutrafin Cycle?

• Starting a new aquarium: Helps establish the beneficial bacteria needed for biological filtration.
• Introducing new fish: Supports the filter when additional fish increase ammonia production.
• After water changes: Provides supplementary bacterial support during routine maintenance.
• After cleaning filters: Useful if beneficial bacterial populations have been disturbed.
• After medication: Helps replenish bacterial activity if medication has affected biological filtration.
• Weekly maintenance: Supports an established aquarium's beneficial bacterial population.

How to Use Nutrafin Cycle 120mL

Follow the manufacturer's directions and calculate the actual water volume of your aquarium before dosing.

New Aquarium Start-Up

For a newly established aquarium, Nutrafin recommends the following three-day treatment schedule:

• Day 1: Add 25mL per 38 litres of aquarium water.
• Day 2: Add 10mL per 38 litres.
• Day 3: Add 10mL per 38 litres.

Continue monitoring ammonia and nitrite throughout the aquarium cycling process. Introduce fish gradually and avoid overstocking until biological filtration is able to manage the waste being produced.

Routine Aquarium Maintenance

• Weekly maintenance: Add 5mL per 38 litres.
• After water changes: Add 5mL per 38 litres according to the manufacturer's instructions.
• After filter maintenance: Add 5mL per 38 litres.
• After adding new fish: Add 10mL per 38 litres.
• After medication: Add 10mL per 38 litres when appropriate.

120mL bottle treatment capacity:

• Approximately 101 litres for the complete three-day new aquarium start-up schedule.
• Approximately 912 litres of total treatment volume at the weekly maintenance dosage.

Always treat replacement tap water with a suitable aquarium water conditioner to neutralise chlorine and chloramine, which can harm beneficial bacteria.

Does Nutrafin Cycle Make a New Aquarium Safe Immediately?

Nutrafin markets Cycle as a fast-acting biological supplement that supports earlier fish introduction. However, adding bottled bacteria does not guarantee that a new aquarium has a fully established nitrogen cycle.

Biological filtration develops as beneficial bacteria colonise aquarium surfaces and filter media. The time required depends on water conditions, bacterial activity, available filter media and the amount of waste being produced.

For the safest aquarium setup, monitor ammonia and nitrite regularly, introduce fish gradually and maintain appropriate water conditions throughout the cycling process.

Nutrafin Cycle can help support this process, but it does not replace responsible aquarium cycling or water testing.

Nutrafin Cycle vs Aquarium Water Conditioner

Nutrafin Cycle and aquarium water conditioners perform different jobs.

Nutrafin Cycle introduces beneficial bacteria to support biological filtration and the natural processing of nitrogen waste.

Water conditioners neutralise chlorine and chloramine in tap water before it is added to an aquarium.

Both can be useful when setting up a new fish tank. The water conditioner protects fish and beneficial bacteria from tap water disinfectants, while Nutrafin Cycle helps establish and support the biological filter.

Product Specifications

• Brand: Nutrafin
• Manufacturer: Hagen
• Product: Cycle Biological Aquarium Supplement
• Volume: 120mL
• Manufacturer code: A7900
• Barcode: 0015561179003
• Product type: Beneficial bacteria aquarium supplement
• Suitable for: Freshwater and saltwater aquariums
• Primary function: Supporting biological filtration and aquarium cycling
• New aquarium Day 1 dosage: 25mL per 38 litres
• New aquarium Days 2 and 3 dosage: 10mL per 38 litres daily
• Weekly maintenance dosage: 5mL per 38 litres
• After adding fish or medication: 10mL per 38 litres
• Refrigeration: Not required

Frequently Asked Questions

What does Nutrafin Cycle do?

Nutrafin Cycle introduces beneficial bacteria that support aquarium biological filtration. These bacteria help process ammonia and nitrite, supporting healthier water conditions in new and established aquariums.

How do I use Nutrafin Cycle in a new aquarium?

For new aquarium start-up, add 25mL per 38 litres on Day 1, followed by 10mL per 38 litres on Days 2 and 3. Continue monitoring ammonia and nitrite while biological filtration becomes established.

Can I add fish immediately after using Nutrafin Cycle?

Nutrafin markets Cycle as a product that supports immediate fish introduction. However, adding bacteria does not guarantee that an aquarium is fully cycled. Introducing fish gradually and testing water regularly is the safer approach.

How much water does Nutrafin Cycle 120mL treat?

The 120mL bottle provides enough supplement for approximately 101 litres across the complete three-day start-up schedule, or approximately 912 litres of total treatment volume at the weekly maintenance dosage.

How often should I add Nutrafin Cycle?

Nutrafin recommends a weekly maintenance dose of 5mL per 38 litres. Different doses apply when starting a new aquarium, introducing fish or following medication.

Can Nutrafin Cycle help after cleaning my aquarium filter?

Yes. Nutrafin Cycle provides additional bacterial support following filter maintenance. However, preserving established biological filter media remains important for maintaining the aquarium nitrogen cycle.

Does Nutrafin Cycle remove chlorine from tap water?

No. Nutrafin Cycle is a beneficial bacteria supplement, not a water conditioner. Treat tap water with a suitable dechlorinator before adding it to the aquarium.

Does Nutrafin Cycle need refrigeration?

No. Nutrafin Cycle uses bio-floc technology designed to maintain bacterial stability without refrigeration. Store according to the instructions on the bottle and check the best-before date.