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 nano fish tank aquarium - fish,

20l nano fish tank aquarium - fish,

£35.99
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20l aquarium fish tank with - tank,

20l aquarium fish tank with - tank,

£29.69
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20l aquarium fish tank with - aquarium,

20l aquarium fish tank with - aquarium,

£29.59
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Aquarium heater submersible - aquarium,

Aquarium heater submersible - aquarium,

£12.99
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43l fish tank glass aquarium - 43l,

43l fish tank glass aquarium - 43l,

£64.99
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Pawhut 51l fish tank with - pawhut,

Pawhut 51l fish tank with - pawhut,

£61.99
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Fluval 20l betta - fluval,

Fluval 20l betta - fluval,

£99.99
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20l aquarium fish tank - fish,

20l aquarium fish tank - fish,

£29.59
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Fluval premium betta aquarium - premium,

Fluval premium betta aquarium - premium,

£119.99
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20l starter kit aquarium fish - 20l,

20l starter kit aquarium fish - 20l,

£33.99
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20l aquarium fish tank with - fish,

20l aquarium fish tank with - fish,

£33.99
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20l aquarium fish - aquarium,

20l aquarium fish - aquarium,

£34.99
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20l aquarium fish tank - 20l,

20l aquarium fish tank - 20l,

£33.99
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20l aquarium fish tank - 20l,

20l aquarium fish tank - 20l,

£29.99
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Quiet fish tank filter - fish,

Quiet fish tank filter - fish,

£23.55
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50w fish tank aquarium - tank,

50w fish tank aquarium - tank,

£10.25
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Pawhut 43l fish tank - pawhut,

Pawhut 43l fish tank - pawhut,

£47.99
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20l aquarium fish tank with - fish,

20l aquarium fish tank with - fish,

£33.99
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Lid feed cover - feed, for

Lid feed cover - feed, for

£10.99
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Stainless steel aquarium - stainless,

Stainless steel aquarium - stainless,

£12.99
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20l nano fish - 20l, aquarium

20l nano fish - 20l, aquarium

£33.99
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Alfagrog e25 ceramic - ceramic, filter

Alfagrog e25 ceramic - ceramic, filter

£32.95
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Fish tank aqurium - in, 1

Fish tank aqurium - in, 1

£6.21
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51l fish tank - fish, glass

51l fish tank - fish, glass

£64.99
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Fish tank glass aquarium with - glass,

Fish tank glass aquarium with - glass,

£61.99
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Fish fun heater thermostat - fun,

Fish fun heater thermostat - fun,

£11.45
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20l aquarium fish - fish, with

20l aquarium fish - fish, with

£29.99
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Pawhut 51l fish tank with - pawhut,

Pawhut 51l fish tank with - pawhut,

£61.99
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Fish tank filter 20l - tank,

Fish tank filter 20l - tank,

£25.02
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Fluval series aquarium - t,

Fluval series aquarium - t,

£25.49
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50w 500w led digital aquarium - 50w-500w,

50w 500w led digital aquarium - 50w-500w,

£18.88
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Quiet fish tank - tank, 4in1

Quiet fish tank - tank, 4in1

£23.17
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Fluval betta aquarium kit 20l - aquarium,

Fluval betta aquarium kit 20l - aquarium,

£99.99
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Superfish white led panorama - superfish,

Superfish white led panorama - superfish,

£54.99
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20l aquarium fish - tank, with

20l aquarium fish - tank, with

£29.99
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Fluval 20l betta aquarium kit - fluval,

Fluval 20l betta aquarium kit - fluval,

£99.99
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Pawhut 51l fish tank with - tank,

Pawhut 51l fish tank with - tank,

£60.95
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Superfish eco heater 50w - superfish,

Superfish eco heater 50w - superfish,

£15.75
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50w aquarium heater - 50w,

50w aquarium heater - 50w,

£11.45
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Superfish start tropical - superfish,

Superfish start tropical - superfish,

£92.99
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Aquatown fish tank with filter - fish,

Aquatown fish tank with filter - fish,

£31.90
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Black aqua one betta - betta, due

Black aqua one betta - betta, due

£99.99
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Fluval betta 20l - betta, replacement

Fluval betta 20l - betta, replacement

£79.99
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Pawhut 43l fish - pawhut, with

Pawhut 43l fish - pawhut, with

£64.99
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Mini aquarium sponge filter - mini,

Mini aquarium sponge filter - mini,

£12.63
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Pawhut 43l fish tank with - 43l,

Pawhut 43l fish tank with - 43l,

£47.95
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Pawhut turtle tank 50l glass - pawhut,

Pawhut turtle tank 50l glass - pawhut,

£62.99
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200w aquarium water heater - 200w,

200w aquarium water heater - 200w,

£11.89
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Aquael shrimp tank set - tank, led

Aquael shrimp tank set - tank, led

£103.99
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Aquarium 50w 500w digital - 50w,

Aquarium 50w 500w digital - 50w,

£15.54
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Aquael platinium 50w - aquael,

Aquael platinium 50w - aquael,

£19.36
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Internal fish tank - internal, filter

Internal fish tank - internal, filter

£20.99
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Nicrew slim aquarium filter - slim,

Nicrew slim aquarium filter - slim,

£17.32
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Quiet fish tank - quiet,

Quiet fish tank - quiet,

£24.70
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Aquarium fish tank heater - aquarium,

Aquarium fish tank heater - aquarium,

£15.44
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Nicrew internal aquarium - nicrew,

Nicrew internal aquarium - nicrew,

£16.28
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Nicrew slim aquarium filter - nicrew,

Nicrew slim aquarium filter - nicrew,

£18.65
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Aquael aquarium platinium - aquael,

Aquael aquarium platinium - aquael,

£23.97
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Hidom aquarium heater - hidom,

Hidom aquarium heater - hidom,

£10.95
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50w 500w led - 50w-500w,

50w 500w led - 50w-500w,

£18.71
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Aqua one dynamic 55l - dynamic, aquarium

Aqua one dynamic 55l - dynamic, aquarium

£159.99
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Nicrew slim aquarium filter - slim,

Nicrew slim aquarium filter - slim,

£23.21
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For xiaomi 20l smart - 20l,

For xiaomi 20l smart - 20l,

£29.86
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Silver aquarium fish - silver,

Silver aquarium fish - silver,

£28.99
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50w 500w led digital aquarium - 50w-500w,

50w 500w led digital aquarium - 50w-500w,

£18.85
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50w hidom aquarium heater - hidom,

50w hidom aquarium heater - hidom,

£3.00
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Aquael plastic ultra safety - plastic,

Aquael plastic ultra safety - plastic,

£31.45
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Nicrew slim aquarium - nicrew,

Nicrew slim aquarium - nicrew,

£18.25
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Evolution aqua micro - aqua, k1

Evolution aqua micro - aqua, k1

£118.95
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Marina cool air - marina, for

Marina cool air - marina, for

£8.49
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Aquarium fish tank heater - aquarium,

Aquarium fish tank heater - aquarium,

£18.65
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Oase bioplus internal aquarium - bioplus,

Oase bioplus internal aquarium - bioplus,

£32.95
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Oase bioplus thermo - /, internal

Oase bioplus thermo - /, internal

£47.50
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Magi mini fish tank - magi,

Magi mini fish tank - magi,

£17.38
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Aquarium nordic 6mm - aquarium,

Aquarium nordic 6mm - aquarium,

£27.75
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Fluval sea evo nano saltwater - fluval,

Fluval sea evo nano saltwater - fluval,

£159.99
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50w aquarium fish - fish, tank

50w aquarium fish - fish, tank

£10.29
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Aquarium fish tank heater - aquarium,

Aquarium fish tank heater - aquarium,

£18.65
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200 300 500w led - 200/300/500w,

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

£18.78
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72w aquarium fish tank water - aquarium,

72w aquarium fish tank water - aquarium,

£117.49
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Fluval m50 submersible - fluval,

Fluval m50 submersible - fluval,

£20.29
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Superfish aqua flow filter - superfish, aqua-flow

Superfish aqua flow filter - superfish, aqua-flow

£14.99
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Nicrew slim aquarium filter - slim,

Nicrew slim aquarium filter - slim,

£63.59
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Fish tank heater aquael 50w - aquael,

Fish tank heater aquael 50w - aquael,

£10.79
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Aquarium chiller cooler 20l - a-aquarium,

Aquarium chiller cooler 20l - a-aquarium,

£116.75
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Nicrew slim aquarium filter - slim,

Nicrew slim aquarium filter - slim,

£69.93
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Oase bioplus internal corner - oase,

Oase bioplus internal corner - oase,

£32.50
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Betta thermal compact heater - thermal,

Betta thermal compact heater - thermal,

£12.90
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Fish tank for - for, +

Fish tank for - for, +

£63.10
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Fluval t50 electronic - t50,

Fluval t50 electronic - t50,

£16.99
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Magi mini fish tank - magi, filter

Magi mini fish tank - magi, filter

£17.41
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Aquael platinum submersible - aquael,

Aquael platinum submersible - aquael,

£23.32
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Adjustable mini aquarium - mini,

Adjustable mini aquarium - mini,

£17.99
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Jbl pro temp premium - pro,

Jbl pro temp premium - pro,

£23.79
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20l led aquarium - includes,

20l led aquarium - includes,

£54.78
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50l sumped non fish - 50l,

50l sumped non fish - 50l,

£26.70
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📊96 listings · from £3 · avg £40.29
⚠️ These listings were last updated more than 16 days ago. Search for fresh listings

Browse 96 20l fish tank listings currently in our index. Prices range from £3 to £159.99, with an average of £40.29. 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: 3ft fish tank stand | 4 foot aquarium | 4ft fish tank | 4ft fish tank stand | 50 litre fish tank | 5ft tank | acan coral | acrylic fish tanks | acrylic tank | aqua fish tank

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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 £3, while premium listings can reach £159.99 — giving you a wide budget spread to work with. The average price of £40.29 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.

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