Fluval Flex 2.0 Freshwater Aquarium 57L
- Includes built in Filter and LED lighting
- Volume: 57 litres
- New and improved version
- Intended for Freshwater use only
- Bold curved front design
- Powerful 3-stage filtration for superior water quality
- Also available in 34 L
- This product comes with a 2-year warranty, excludes cracked glass and the cabinet.
Discover modern aquarium design and flexibility with the Fluval Flex 2.0 Aquarium Kit. Available in 34L and 57L sizes, the Flex 2.0 combines striking style with advanced functionality for the ultimate freshwater setup.
With its clean, modern design and powerful performance, the Fluval Flex 2.0 is ideal for beginners and experienced hobbyists alike.
Key Highlights:
1. Customizable RGB + White LED Lighting
The Fluval Flex 2.0 features adjustable RGB + White LED lights with a remote control, offering over 80 colour blends and dynamic effects. This not only enhances the aquarium’s visual appeal, but also creates the right light conditions for fish and plants. A customizable lighting system means you can simulate natural day/night cycles, reduce stress for your fish, and highlight the colours of your aquascape beautifully.
Why it’s good: It gives hobbyists creative freedom, promotes plant growth with a balanced 6500–7000K spectrum, and helps maintain a natural, healthy environment for aquatic life.
2. Advanced Integrated 3-Stage Filtration
Behind the sleek curved design is a powerful yet discreet filtration system. It combines mechanical filtration (foam block to trap debris), chemical filtration (activated carbon to remove toxins and odours), and biological filtration (BioMax or Bio-FX for beneficial bacteria growth). The modular media baskets allow easy customization based on your aquarium’s needs.
Why it’s good: Ensures consistently clean and clear water, supports a balanced nitrogen cycle, and allows aquarists to adapt the filter setup for fish, plants, or aquascaping preferences.
3. User-Friendly Design with Smart Upgrades
The new Flex 2.0 comes with practical cover enhancements, such as a feeding port for quick mealtimes, an integrated heater channel for even heat distribution, and a power cord channel to keep wires neat. The dual adjustable output nozzles allow you to fine-tune water flow to simulate natural currents or protect delicate plants and fish. Plus, the whisper-quiet pump ensures minimal disturbance.
Why it’s good: These thoughtful upgrades make maintenance easier, reduce stress for fish, keep the aquarium tidy, and ensure a quiet, enjoyable experience for the aquarist.
How easy it is to set up an aquarium?
Place the tank on a sturdy, level surface away from direct sunlight and drafts. Rinse the tank, substrate (like gravel or sand), and ornaments with water—don’t use soap. Plug in and test all equipment such as heaters, filters, air pumps, and lights. Remember to make sure the heaters are fully submerged before turning them on.
Spread the substrate evenly at the bottom of the tank. Arrange your decorations—rocks, plants, and ornaments—how you like. When filling the tank, add a water conditioner to remove chlorine and other chemicals from the tap water, then gently pour the water to avoid disturbing the substrate.
Add a bacterial supplement to help cycle your tank, it can take a couple of weeks for the environment to become safe enough for your fish to thrive in. Make sure to regularly use test kits to monitor ammonia, nitrite, and nitrate levels.
Maintain your aquarium by doing weekly water changes of 10-20%, cleaning or replacing filter media as needed, and regularly checking water quality and fish health.
What else should be brought?
- Tap water conditioner - eliminates chlorine and chloramines from tap water, making it safe for fish.
- Test kits - monitor key water parameters such as pH, ammonia, nitrite, and nitrate levels to ensure the best water conditions.
- A thermometer is crucial for keeping track of water temperature, especially for tropical fish.
- fish food that is suitable for your fish species, along with occasional treats.
- A net is important for safely transferring fish without causing stress or injury.
- A gravel vacuum or siphon will help clean the substrate and perform water changes.
- If you wish to have a tropical tank, please ensure you have a heater. Our heater range can be found at the following link: https://www.fishkeeper.co.uk/aquarium-products/heaters.
- Decorations (aquarium background, live or artificial plants, rocks, wood, ornaments) to create hiding spots and a more natural environment.
- Air pump and air stone can help improve oxygenation and water circulation.
- Extra filter media on hand to replace as needed when it becomes dirty or worn out.
- Dedicated bucket for aquarium tasks to avoid contamination from household cleaning products
- Tweezers or forceps are handy for planting live plants or rearranging decorations.
- A quarantine tank is valuable for isolating new or sick fish to prevent disease spread.
- Fish medication for common issues like ich or fin rot.
What species of fish will be suitable for this aquarium?
This aquarium is well-suited for cooler water fish, making it an excellent choice for species like minnows and danios. Minnows such as the vibrant White Cloud Mountain Minnows or the active Rosy Red Minnows are ideal for this setup. They are hardy and adapt well to cooler water temperatures. Similarly, danios, including popular Zebra Danios, are known for their lively behaviour and adaptability to cooler conditions, adding dynamic movement to your tank.
If you're interested in a wider variety of fish, adding a heater to the aquarium allows you to explore species that prefer warmer water. With a heater, you can consider tropical fish such as tetras, guppies, and platies, which thrive in slightly warmer temperatures typically ranging from 22-26°C.
If you are unsure what fish you would like, then pop into your local store or visit our comprehensive databank for detailed information on our wide variety of fish species.
57L
| Flex 34 | Flex 57 | |
| Aquarium Volume | 34 L | 57 L |
| Aquarium Dimensions (L x W x H) | 35 x 34 x 33 cm | 41.5 x 40 x 39 cm |
| Filter Flow Rate L/H | 230 L/H | 500 L/H |
| Heater | N/A | N/A |
| Lighting W | 5.3 W | 6.6 W |
| Lighting Lumens | 1500 lm | 2000 lm |
| Lighting Colour Temp | 6500-7000 K | 6500-7000 K |
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Delivery
Delivery costs for your order will be calculated during the checkout process based on your delivery address and the contents of your basket. You will only pay one delivery charge for your order. Express delivery is FREE for online orders OVER £39 unless any of the points below become a factor.
- Some large items like aquariums, ponds and pond liners will have an additional charge of £45.00 to help offset the cost of a pallet delivery.
- Orders containing a physical gift card will have an additional charge of £2.45 to cover the cost of materials and delivery (digital gift cards are a free alternative).
- Orders to highlands, islands and Northern Ireland may incur an additional delivery charge displayed at checkout this is based on the postal code provided. DPD provides a list of postal codes which have additional surcharges. Some of these post codes may also take 2 working days to arrive, even on express. Pallet deliveries cannot be sent to these post codes.
We only ship to the UK and cannot ship internationally.
We aim to dispatch items that are currently in stock on the same working day if they are ordered before 2.45 pm (excluding Bank Holidays). Orders after 3pm will be dispatched the following working day, unless it fits any of the below criteria:
- Orders containing live plants will take up to 2 weeks to arrive. We take a week's worth of customer orders and then inform the plant farms of the specific quantities we need to fulfil that week's order to avoid wastage.
- Pallet orders containing large items like big aquariums will take additional time to arrive as they are sent by a third party. These orders will NOT be dispatched until we have been in touch to arrange a delivery date, this is to ensure someone is available at your address to sign for the delivery. Deliveries will generally be delivered ‘curb side’ within the terms of the agreement we have with our couriers so you will need to make arrangements to transfer larger items into your home yourself. Unfortunately, our drivers are not insured to transfer the aquarium into your home.
- Physical gift cards and items from the gift shop (such as clothes, towels etc) are sent with 1st Class Royal Mail. Delivery usually takes 1-2 working days, though in rare cases and orders placed closer to public holidays (Christmas, Father’s day, Mother’s day etc.) may be longer.
Returns
If you are not 100% satisfied with your purchase online from our website, you can return the product and get a full refund or exchange the product for another one, for up to 21 days from the date you purchased it.
We strongly suggest signing up for an account with fishkeeper.co.uk as this will allow for some additional returns options like return to your local store.
If you checkout as a guest you will need to return the product to Maidenhead Aquatics, PO Box 619, Egham, Surrey, TW20 2BS, please package the order (along with a packing slip or a note including your name, address and order number).
Large pallet items like aquariums are deemed delivered successfully with no damage once the the driver has left the property. If a report of damage is submitted after the driver has left we may be unable to assist with replacements. We recommend refusing a damaged delivery, this is the fastest resolution.
Our full terms and conditions can be found here. When you place an order with us online you are agreeing to these terms and conditions.
For delivery before Christmas, orders must be placed on or before 3pm on Wednesday 20th December. We cannot guarantee delivery of these orders pre-Christmas as we are reliant on our couriers, but will use our best endeavours to get orders placed on this date out to you before Christmas. For full details of our festive delivery and opening times click here
Please note: online orders placed after 3pm on Friday 22nd December will not be dispatched until the New Year. For full details of our festive delivery and opening times click here