For Sale UK

20l fish tank

4

20l fish tank for sale on largest auction and classifieds sites

Home / Fish & Aquariums / 20l fish tank refurbished & used for sale | For Sale UK
20l aquarium fish - fish, tank

20l aquarium fish - fish, tank

£33.99
Buy It Now

» View on eBay #sponsored
Fish tank aquarium - fish,

Fish tank aquarium - fish,

£49.99
Buy It Now

» View on eBay #sponsored
Aquarium fish tank kit - tank, led

Aquarium fish tank kit - tank, led

£49.99
Buy It Now

» View on eBay #sponsored
20l aquarium fish tank with - tank,

20l aquarium fish tank with - tank,

£33.99
Buy It Now

» View on eBay #sponsored
20l nano fish tank - 20l,

20l nano fish tank - 20l,

£33.99
Buy It Now

» View on eBay #sponsored
43l fish tank glass aquarium - fish,

43l fish tank glass aquarium - fish,

£34.99
Buy It Now

» View on eBay #sponsored
Fluval 20l betta aquarium - betta, fish

Fluval 20l betta aquarium - betta, fish

£6.99
Buy It Now

» View on eBay #sponsored
Pawhut 51l glass aquarium - glass, fish

Pawhut 51l glass aquarium - glass, fish

£33.99
Buy It Now

» View on eBay #sponsored
Complete litre aquarium - complete, 20

Complete litre aquarium - complete, 20

£33.99
Buy It Now

» View on eBay #sponsored
Fluval premium betta aquarium - premium,

Fluval premium betta aquarium - premium,

£119.99
Buy It Now

» View on eBay #sponsored
20l aquarium fish tank with - 20l,

20l aquarium fish tank with - 20l,

£33.99
Buy It Now

» View on eBay #sponsored
Lid feed cover - cover, fluval

Lid feed cover - cover, fluval

£10.99
Buy It Now

» View on eBay #sponsored
Aquarium heater submersible - aquarium,

Aquarium heater submersible - aquarium,

£12.99
Buy It Now

» View on eBay #sponsored
Fish tank ultra - fish,

Fish tank ultra - fish,

£39.99
Buy It Now

» View on eBay #sponsored
Swell led complete aquarium - swell,

Swell led complete aquarium - swell,

£70.99
Buy It Now

» View on eBay #sponsored
Small glass aquarium tank - glass, 28l

Small glass aquarium tank - glass, 28l

£49.09
Buy It Now

» View on eBay #sponsored
Superfish white led panorama - superfish,

Superfish white led panorama - superfish,

£50.99
Buy It Now

» View on eBay #sponsored
Black aqua one betta due - due, glass

Black aqua one betta due - due, glass

£99.99
Buy It Now

» View on eBay #sponsored
Fish fun heater - heater, thermostat

Fish fun heater - heater, thermostat

£10.45
Buy It Now

» View on eBay #sponsored
Quiet fish tank filter - quiet,

Quiet fish tank filter - quiet,

£32.93
Buy It Now

» View on eBay #sponsored
Stainless steel aquarium - steel,

Stainless steel aquarium - steel,

£9.34
Buy It Now

» View on eBay #sponsored
200 300 500w led digital - 200/300/500w,

200 300 500w led digital - 200/300/500w,

£18.19
Buy It Now

» View on eBay #sponsored
20l starter kit aquarium - starter,

20l starter kit aquarium - starter,

£33.99
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium - slim,

Nicrew slim aquarium - slim,

£17.47
Buy It Now

» View on eBay #sponsored
Aquael shrimp tank set led - d&n,

Aquael shrimp tank set led - d&n,

£103.99
Buy It Now

» View on eBay #sponsored
Fish tank glass aquarium with - glass,

Fish tank glass aquarium with - glass,

£33.99
Buy It Now

» View on eBay #sponsored
Fish tank aqurium small 1 - aqurium, in

Fish tank aqurium small 1 - aqurium, in

£6.21
Buy It Now

» View on eBay #sponsored
Fluval 20l betta - betta, aquarium

Fluval 20l betta - betta, aquarium

£99.99
Buy It Now

» View on eBay #sponsored
Small fish tank aquarium - fish,

Small fish tank aquarium - fish,

£29.59
Buy It Now

» View on eBay #sponsored
Ciano aqua aquarium - aqua, with

Ciano aqua aquarium - aqua, with

£51.91
Buy It Now

» View on eBay #sponsored
Swell cube fish tank - |,

Swell cube fish tank - |,

£60.99
Buy It Now

» View on eBay #sponsored
Swell fish tank 40cm - swell,

Swell fish tank 40cm - swell,

£72.99
Buy It Now

» View on eBay #sponsored
Alfagrog e25 ceramic - e25,

Alfagrog e25 ceramic - e25,

£32.95
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium filter - nicrew,

Nicrew slim aquarium filter - nicrew,

£17.46
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium - slim,

Nicrew slim aquarium - slim,

£17.32
Buy It Now

» View on eBay #sponsored
Easy maintain fish - fish, tank

Easy maintain fish - fish, tank

£31.90
Buy It Now

» View on eBay #sponsored
Fluval series aquarium - fluval,

Fluval series aquarium - fluval,

£24.99
Buy It Now

» View on eBay #sponsored
Fluval betta aquarium kit 20l - betta,

Fluval betta aquarium kit 20l - betta,

£99.99
Buy It Now

» View on eBay #sponsored
Rimless low iron open - low,

Rimless low iron open - low,

£42.30
Buy It Now

» View on eBay #sponsored
Swell glass aquarium 40cm - 40cm, –

Swell glass aquarium 40cm - 40cm, –

£51.34
Buy It Now

» View on eBay #sponsored
Magi mini fish - mini,

Magi mini fish - mini,

£17.96
Buy It Now

» View on eBay #sponsored
Seachem sicce tidal hang - tidal, hang-on

Seachem sicce tidal hang - tidal, hang-on

£60.99
Buy It Now

» View on eBay #sponsored
Jbl protemp aquarium - protemp, s

Jbl protemp aquarium - protemp, s

£23.49
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium filter - slim,

Nicrew slim aquarium filter - slim,

£17.71
Buy It Now

» View on eBay #sponsored
Fluval betta 20l - fluval,

Fluval betta 20l - fluval,

£23.99
Buy It Now

» View on eBay #sponsored
Magi mini fish tank - tank, filter

Magi mini fish tank - tank, filter

£19.63
Buy It Now

» View on eBay #sponsored
Superfish eco heater - superfish,

Superfish eco heater - superfish,

£11.00
Buy It Now

» View on eBay #sponsored
Magi mini fish tank - magi,

Magi mini fish tank - magi,

£19.52
Buy It Now

» View on eBay #sponsored
100 200w aquarium water heater - 100-200w,

100 200w aquarium water heater - 100-200w,

£12.87
Buy It Now

» View on eBay #sponsored
Nicrew magi mini internal - nicrew,

Nicrew magi mini internal - nicrew,

£18.27
Buy It Now

» View on eBay #sponsored
Hidom submersible tropical - hidom,

Hidom submersible tropical - hidom,

£10.95
Buy It Now

» View on eBay #sponsored
Fluval sea evo nano - sea,

Fluval sea evo nano - sea,

£159.99
Buy It Now

» View on eBay #sponsored
Magi mini fish tank - magi, filter

Magi mini fish tank - magi, filter

£20.70
Buy It Now

» View on eBay #sponsored
Quiet fish tank filter 4in1 - quiet,

Quiet fish tank filter 4in1 - quiet,

£35.98
Buy It Now

» View on eBay #sponsored
50w 500w led digital aquarium - led,

50w 500w led digital aquarium - led,

£18.19
Buy It Now

» View on eBay #sponsored
Fish tank filter 20l - tank,

Fish tank filter 20l - tank,

£18.99
Buy It Now

» View on eBay #sponsored
Pawhut turtle tank - tank, glass

Pawhut turtle tank - tank, glass

£62.99
Buy It Now

» View on eBay #sponsored
Superfish eco heater - superfish,

Superfish eco heater - superfish,

£15.75
Buy It Now

» View on eBay #sponsored
Magi mini fish - mini,

Magi mini fish - mini,

£19.40
Buy It Now

» View on eBay #sponsored
50l turtle tank glass - glass,

50l turtle tank glass - glass,

£62.99
Buy It Now

» View on eBay #sponsored
Betta thermal compact heater - betta,

Betta thermal compact heater - betta,

£12.90
Buy It Now

» View on eBay #sponsored
Silver aquarium fish tank - silver,

Silver aquarium fish tank - silver,

£28.99
Buy It Now

» View on eBay #sponsored
Pawhut turtle tank 50l glass - turtle,

Pawhut turtle tank 50l glass - turtle,

£62.99
Buy It Now

» View on eBay #sponsored
Quiet fish tank filter 4in1 - fish,

Quiet fish tank filter 4in1 - fish,

£8.65
Buy It Now

» View on eBay #sponsored
Aquarium 50w 500w - aquarium,

Aquarium 50w 500w - aquarium,

£15.54
Buy It Now

» View on eBay #sponsored
Fluval aquarium heater - fluval, t

Fluval aquarium heater - fluval, t

£22.49
Buy It Now

» View on eBay #sponsored
Quiet fish tank filter - quiet,

Quiet fish tank filter - quiet,

£27.75
Buy It Now

» View on eBay #sponsored
Aquael opti 54l - opti, glass

Aquael opti 54l - opti, glass

£108.99
Buy It Now

» View on eBay #sponsored
Quiet fish tank - fish,

Quiet fish tank - fish,

£25.99
Buy It Now

» View on eBay #sponsored
For xiaomi 20l smart fish - smart, tank

For xiaomi 20l smart fish - smart, tank

£29.86
Buy It Now

» View on eBay #sponsored
Hidom aquarium heater - hidom,

Hidom aquarium heater - hidom,

£10.95
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium filter - slim,

Nicrew slim aquarium filter - slim,

£18.48
Buy It Now

» View on eBay #sponsored
Fish tank for - tank,

Fish tank for - tank,

£63.10
Buy It Now

» View on eBay #sponsored
Superfish aquaflow aquarium - aquaflow,

Superfish aquaflow aquarium - aquaflow,

£14.99
Buy It Now

» View on eBay #sponsored
Aquarium nordic 6mm - aquarium,

Aquarium nordic 6mm - aquarium,

£27.75
Buy It Now

» View on eBay #sponsored
Efficient internal fish tank - internal,

Efficient internal fish tank - internal,

£22.95
Buy It Now

» View on eBay #sponsored
Tropical aquarium fish - aquarium, tank

Tropical aquarium fish - aquarium, tank

£17.30
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium filter - nicrew,

Nicrew slim aquarium filter - nicrew,

£19.38
Buy It Now

» View on eBay #sponsored
Aquarium 50w 500w - to, digital

Aquarium 50w 500w - to, digital

£17.38
Buy It Now

» View on eBay #sponsored
Aquarium filter internal - aquarium,

Aquarium filter internal - aquarium,

£21.99
Buy It Now

» View on eBay #sponsored
Mini 10w usb - mini, heater

Mini 10w usb - mini, heater

£19.19
Buy It Now

» View on eBay #sponsored
Superfish aqua flow - superfish,

Superfish aqua flow - superfish,

£12.50
Buy It Now

» View on eBay #sponsored
Hidom submersible aquarium - submersible,

Hidom submersible aquarium - submersible,

£11.95
Buy It Now

» View on eBay #sponsored
Oase bioplus thermo - oase,

Oase bioplus thermo - oase,

£47.50
Buy It Now

» View on eBay #sponsored
12l glass rectangular - 12l,

12l glass rectangular - 12l,

£21.50
Buy It Now

» View on eBay #sponsored
Nicrew slim aquarium filter - aquarium,

Nicrew slim aquarium filter - aquarium,

£18.02
Buy It Now

» View on eBay #sponsored
Hagen marina submersible - marina,

Hagen marina submersible - marina,

£14.95
Buy It Now

» View on eBay #sponsored
Internal fish tank - tank, filter

Internal fish tank - tank, filter

£22.99
Buy It Now

» View on eBay #sponsored
Nicrew magi mini fish tank - mini,

Nicrew magi mini fish tank - mini,

£18.33
Buy It Now

» View on eBay #sponsored
Aqua one dynamic 55l aquarium - one,

Aqua one dynamic 55l aquarium - one,

£159.99
Buy It Now

» View on eBay #sponsored
Superfish aqua flow filter - superfish, aqua-flow

Superfish aqua flow filter - superfish, aqua-flow

£14.99
Buy It Now

» View on eBay #sponsored
Quiet fish tank filter - fish,

Quiet fish tank filter - fish,

£35.98
Buy It Now

» View on eBay #sponsored
Magi mini fish tank filter - fish,

Magi mini fish tank filter - fish,

£19.63
Buy It Now

» View on eBay #sponsored
Nicrew magi mini fish - mini,

Nicrew magi mini fish - mini,

£19.05
Buy It Now

» View on eBay #sponsored
Small nano aquarium - aquarium, tank

Small nano aquarium - aquarium, tank

£34.99
Buy It Now

» View on eBay #sponsored
Led glass aquarium fish tank - glass,

Led glass aquarium fish tank - glass,

£29.95
Buy It Now

» View on eBay #sponsored

Looking for more 20l fish tank?

Search eBay live — fresh results filtered for the best value, updated every hour.

🔍 Search live deals
📊96 listings · from £6.21 · avg £35.76
⚠️ These listings were last updated more than 9 days ago. Search for fresh listings

Browse 96 20l fish tank listings currently in our index. Prices range from £6.21 to £159.99, with an average of £35.76. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about 20l fish tank →

Try this: 3 foot aquarium | 3ft fish tank stand | 4 foot aquarium | 4ft fish tank | 4ft fish tank stand | 50 litre fish tank | 5ft tank | 7 ft fish tank | acan coral | acrylic fish tanks

Shop by budget

< £25 £25 – £50 £50 – £100 £100 – £200 £200 – £500 > £500

Everything you need to know about 20l fish tank

Whether you are looking for a brand-new or second-hand 20l fish tank, eBay offers one of the largest selections available online. With 96 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at £6.21, while premium listings can reach £159.99 — giving you a wide budget spread to work with. The average price of £35.76 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.

🔍 20l fish tank Search live on eBay