Best Aquariums Deals Online in the UK (25 Deals Found)

Last Updated - 16/12/2025 Sort By:

Best Choice
Diversa

New
Diversa Aquarium Professional Fish Tank - Real Glass, Standard Rectangle AQUARIUM ONLY - 25L (40x25x25cm)
Premium Quality Aquarium - Diversa offers a high-quality glass aquarium made with Guardian Glass, ensuring durability an

£33.95
Craftsboys

New
Craftsboys 10L Fish Tank, Nano Glass Aquarium, Upgrade Filter system and LED Light, for Freshwater & Marine, Filter Ball
COMPLETE KIT: Contains essential accessories for a 10L aquarium including glass tank, LED lighting, filter.

£38.99
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New
**BRAND NEW** Fish Tank Aquarium & Optional Stand: Heater, Filter & More Include
58L Fish Tank and Optional Stand. Perfect beginner or child’s setup! Simply add water and fish to get going! • 50W Heate

£139.99
PawHut

New
PawHut Aquarium 28L Glass Fish Tank w/Filter, LED Lighting, Water Pump
Easy to maintain: This fish tank has a cleaning system, including a rainshower-type filter with filter cotton and air su

£69.99
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New
Neptunian Cube T45 Desktop Fish Tank
Neptunian Cube T45 Desktop aquarium, it is new and never used however isn’t in its original packaging, so only been unbo

£104.70
Marina

New
Marina 360 Aquarium with Remote Control LED Lighting, Multi-colour, 10 Litre,Blue,Green,Red
Now includes a remote to control the lighting

£54.99
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Best Value
Fluval

New
Fluval Flex 2.0 Black Aquarium Kit 57 L
Unique, vertically bent glass aquarium design

£142.99
New
Advanced Acrylic Aquarium Overflow Box with Effortless Priming System 5000L/H UK
【Overflow Comb】: With overflow box guide protection comb, can make the water evenly dispersed, and can prevent fish, aqu

£104.40
Vehipa

New
Vehipa Fish Tank, 9L Aquarium Starter Kits with Smart Humidifier, Temperature Display, 7-Color Lighting, 3 in 1 Quiet Pu
Smart Multi-Functional Aquarium：9L fish tank kit with self-circulating 3-in-1 pump and adjustable 7 colors lighting syst

£65.99
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Refurbished
CO2 Carbon Dioxide Fire Extinguisher 2kg & 5kg, Fish Tanks, Aquariums & Training
5kg CO2 Carbon Dioxide Fire Extinguisher, CE, BS Kitemarked, Wall Bracket, Horn. 2kg CO2 Carbon Dioxide Fire Extinguishe

£50.00
Diversa

New
Diversa Aquarium Professional Fish Tank - Real Glass, Standard Rectangle AQUARIUM ONLY - 45L (50x30x30cm)
Premium Quality Aquarium - Diversa offers a high-quality glass aquarium made with Guardian Glass, ensuring durability an

£49.95 £59.95
Interpet

New
Interpet Aqua Cube Glass Fish Tank Aquarium with Integrated LED Lighting and Easy Care Filter, 28L, Clear/White
Bring a dash of colour and style to your home with this little gem of an aquarium

£79.94 £88.49
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New
DIVERSA Aquarium Fish Tank Standard & Bow Front ALL SIZES Real Guardian Glass!
This way, you will know exactly when to expect your Diversa Aquarium. Our aquariums, for example, are constructed with o

£249.95
Betrome

New
Fish Tank, 17L Glass Aquarium with Filter System, LED Lights, Water Pump, Betta Fish Tank for Goldfish, Shrimps, White
CAPACITY: 17-litre glass aquarium perfect for small fish species like bettas and goldfish, providing ample swimming spac

£49.99
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New
Fluval Flex 2.0 LED Aquarium Nano Fish Tank Black 34L 57L Freshwater
Available Sizes: 34L (9 US Gal) and 57L (15 US Gal). Water Flow Options: Dual adjustable nozzles on both models; 57L inc

£99.99
Amtra

New
Amtra Crystal Globe - Fishbowl in transparent glass, Goldfish Aquarium, hand blown, 30 CM
PACKAGE CONTENTS: Goldfish bowl in transparent glass, with a diameter of 30 CM.

£25.79
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New
DIVERSA AQUARIUM Fish Tank with LED LID Standard & Bow Front - Guardian Glass
This way, you will know exactly when to expect your Diversa Aquarium. Our aquariums, for example, are constructed with o

£89.95
New
Ciano Aqua 20 Classic Aquarium White/Black with Filter Beginner Fish Tank
The AQUA 20 Classic is a compact glass aquarium, ideal for beginners or as a secondary tank. Glass aquarium with protect

£39.45
New
SEACHEM PRIME DECHLORINATOR AMMONIA NITRITE NITRATE REMOVER AQUARIUM FISH TANK
Don't wait—order now and enjoy a cleaner, healthier aquarium! Comprehensive Removal: Efficiently removes chlorine, chlor

£134.95
New
Aquael Glass Aquarium Fish Tank Aquarium Aquascape Bare Starter
The Aquael Glass Aquarium is more than just a tank; it's a gateway to a new hobby or an expansion of your current passio

£54.99
New
Fish R Fun Heater Thermostat Submersible Tropical Aquarium Fish Tank
Ensure your aquatic friends stay happy and healthy with the Fish R Fun Aquarium Heater. Always unplug all appliances in

£9.50
New
Hidom ProHeat Quartz Aquarium Heater Submersible Fish Tank Thermostat 25 to 500w
The Hidom ProHeat HT-8 Series Quartz Glass Aquarium Heater has been designed and manufactured by industry veterans and w

£12.95
New
Hidom Internal Fish Tank Aquarium Filter Submersible with Spray Bar Included
The Hidom AP range of internal filters are ideal for both freshwater and marine aquariums from 40 to 250 litres in size.

£10.45
New
Koi Carp pond Quarantine/grow /treatment tank vat
Hi you are looking at one koi Inspection/stock tank They have an average thickness of 6mm and are moulded in one piece f

£150.07
New
Oval Mini Desktop Jellyfish Aquarium Tank Kit for Real Live Jellyfish Fish Tank
Suitable for 1-3 Jellyfish petite jellyfish (Eirene lactoides, Leuckartiara octona) or one small jellyfish. Live Jellyfi

£64.13

25 Aquariums deals are available from: Amazon, eBay stores, starting from £9.50.
The biggest discount we found is 10%% on Diversa Aquarium Professional Fish Tank - Real Glass, Standard Rectangle AQUARIUM ONLY - 25L (40x25x25cm) at Amazon.
The lowest price we found is £9.50 while the highest is £249.95.
Prices for the best Aquariums deals average at £77.12.
Last updated on December 16, 2025.
We scanned these quality online stores and more to deliver you with the best offers online available for Aquariums.