20l fish tank
20l fish tank for sale on Ireland's largest auction and classifieds sites
Fluval 20l betta aquarium - betta, fish - £99.99
Fluval betta premium • Integrated water change • Feature ensures effortless - Free postage - New and Used
Fluval betta premium • Integrated water change • Feature ensures effortless - Free postage - New and Used
Fluval betta 20l replacement - betta, - £79.99
Compatibility fluval betta • 20l aquarium filter • Such have huge - Free postage - New and Used
Compatibility fluval betta • 20l aquarium filter • Such have huge - Free postage - New and Used
Aquarium heater submersible - aquarium, - £12.99
Preset heater set • Degrees appropriate most • Tropical fish shrimp - Free postage - New and Used
Preset heater set • Degrees appropriate most • Tropical fish shrimp - Free postage - New and Used
Fluval 20l betta aquarium kit - 20l, - £99.99
Premium aquarium kit • Fluval betta 22.7l • Has been created - Free postage - New and Used
Premium aquarium kit • Fluval betta 22.7l • Has been created - Free postage - New and Used
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Fish fun heater thermostat - r, - £10.99
Ensure your aquatic • Friends stay happy • Healthy fish fun - Free postage - New and Used
Ensure your aquatic • Friends stay happy • Healthy fish fun - Free postage - New and Used
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48 listings · from £6.39 · avg £43.27
⚠️ These listings were last updated more than 16 days ago.
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Browse 48 20l fish tank listings currently in our index. Prices range from £6.39 to £159.99, with an average of £43.27. 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 →
Stainless steel aquarium - steel, - £11.69
Aquariums between 20l • 500l 50w 100w • 200w 300w 500w - Free postage - New and Used
Aquariums between 20l • 500l 50w 100w • 200w 300w 500w - Free postage - New and Used
Superfish white led - superfish, - £95.99
Panorama 49l capacity • Led lighting great • Larger fish more - Free postage - New and Used
Panorama 49l capacity • Led lighting great • Larger fish more - Free postage - New and Used
Lid feed cover for - lid, fluval - £10.99
- Free postage - New and Used
- Free postage - New and Used
Fluval aquarium heater - fluval, t - £22.49
Suitable aquariums 300l • Available five sizes • These heaters cater - Free postage - New and Used
Suitable aquariums 300l • Available five sizes • These heaters cater - Free postage - New and Used
200 300 500w - 200/300/500w, digital - £18.31
Fish tank aquarium • Heating rod fresh • Sea water can - Free postage - New and Used
Fish tank aquarium • Heating rod fresh • Sea water can - Free postage - New and Used
Alfagrog e25 ceramic - ceramic, filter - £32.95
Alfagrog filter substrate • Highly porous which • Gives large bacteria - Free postage - New and Used
Alfagrog filter substrate • Highly porous which • Gives large bacteria - Free postage - New and Used
Fluval betta aquarium - betta, 20l - £99.99
Custom betta filtration • Kit natural soft • Glow led lighting - Free postage - New and Used
Custom betta filtration • Kit natural soft • Glow led lighting - Free postage - New and Used
Black aqua one - betta, due - £99.99
Black out separation • Walls allow betta • Fish kept next - Free postage - New and Used
Black out separation • Walls allow betta • Fish kept next - Free postage - New and Used
50w 500w led - 50w-500w, aquarium - £14.23
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Hidom submersible tropical - hidom, - £10.95
These quality heaters • Are easy adjust • Will regulate temperature - Free postage - New and Used
These quality heaters • Are easy adjust • Will regulate temperature - Free postage - New and Used
Fish tank aqurium small 1 - tank, - £7.19
- Free postage - New and Used
- Free postage - New and Used
Fluval series aquarium - t, - £26.99
360 indicator light • Ring displays heat • Mode clearly from - Free postage - New and Used
360 indicator light • Ring displays heat • Mode clearly from - Free postage - New and Used
Nicrew slim aquarium - nicrew, - £16.67
Nicrew slim aquarium • Great filter option • Nano tanks used - Free postage - New and Used
Nicrew slim aquarium • Great filter option • Nano tanks used - Free postage - New and Used
Fluval premium betta aquarium - fluval, - £119.99
Fluval betta premium • Aquarium kit 20l • Filtration multiple slots - Free postage - New and Used
Fluval betta premium • Aquarium kit 20l • Filtration multiple slots - Free postage - New and Used
Superfish start led fish - superfish, - £63.10
Superfish start led • Fish tank bundle • Starter kit includes - Free postage - New and Used
Superfish start led • Fish tank bundle • Starter kit includes - Free postage - New and Used
Superfish start tropical - start, 50 - £82.99
Superfish start tropical • Aquarium kit key • Aqua flow 100 - Free postage - New and Used
Superfish start tropical • Aquarium kit key • Aqua flow 100 - Free postage - New and Used
Aqua one dynamic 55l aquarium - one, - £159.99
Experience striking vertical • Elegance aqua one • Dynamic aquarium range - Free postage - New and Used
Experience striking vertical • Elegance aqua one • Dynamic aquarium range - Free postage - New and Used
Fluval betta 20l natural - betta, - £124.99
From fluval range • Finished natural soft • Glow led lighting - Free postage - New and Used
From fluval range • Finished natural soft • Glow led lighting - Free postage - New and Used
Marina cool air - pump, nano - £7.95
Such have huge • Wealth experience online • Trading present list - Free postage - New and Used
Such have huge • Wealth experience online • Trading present list - Free postage - New and Used
100 200w aquarium - 100-200w, - £12.48
Dual heating wires • Ensures uniform stable • Energy efficiency long - Free postage - New and Used
Dual heating wires • Ensures uniform stable • Energy efficiency long - Free postage - New and Used
Ciano internal aquarium power - ciano, - £19.79
Ciano cf20 internal • Power filter available • Sizes suit aquariums - Free postage - New and Used
Ciano cf20 internal • Power filter available • Sizes suit aquariums - Free postage - New and Used
Internal aquarium fish tank - £8.99
Qzq filter fish • Tanks quiet aquarium • Filters adjustable flow - Free postage - New and Used
Qzq filter fish • Tanks quiet aquarium • Filters adjustable flow - Free postage - New and Used
Pawhut turtle tank 50l - tank, - £59.99
Easy clean hole • Bottom 100cm water • Pipe this terrapin - Free postage - New and Used
Easy clean hole • Bottom 100cm water • Pipe this terrapin - Free postage - New and Used
20l 35l fish tank aquarium - 20l/35l, - £125.98
Wide range applications • Aquarium water chiller • Cooling system temperature - Free postage - New and Used
Wide range applications • Aquarium water chiller • Cooling system temperature - Free postage - New and Used
Aquarium heater submersible - heater, - £11.95
Hidom proheat aquarium • Heater multiple sizes • 25w 500w adjustable - Free postage - New and Used
Hidom proheat aquarium • Heater multiple sizes • 25w 500w adjustable - Free postage - New and Used
Superfish aquaflow aquarium - aquaflow, - £14.99
Superfish internal aquarium • Water algae filter • Pads cf20 reduce - Free postage - New and Used
Superfish internal aquarium • Water algae filter • Pads cf20 reduce - Free postage - New and Used
Aquarium 50w 500w - aquarium, digital - £18.79
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Nicrew slim aquarium filter - nicrew, - £16.19
Nicrew slim aquarium • Filter quiet fish • Tank hob filters - Free postage - New and Used
Nicrew slim aquarium • Filter quiet fish • Tank hob filters - Free postage - New and Used
Nicrew slim aquarium - aquarium, filter - £15.70
Video showcases product • Flow too strong • Previous page next - Free postage - New and Used
Video showcases product • Flow too strong • Previous page next - Free postage - New and Used
10l 20l water carrier tank - carrier, - £6.39
Available 10l 20l • Sizes features integrated • Carry handle easy - Free postage - New and Used
Available 10l 20l • Sizes features integrated • Carry handle easy - Free postage - New and Used
Nicrew slim aquarium filter - slim, - £18.16
Video showcases product • Flow too strong • Previous page next - Free postage - New and Used
Video showcases product • Flow too strong • Previous page next - Free postage - New and Used
Fluval series aquarium - fluval, - £23.99
360 indicator light • Ring displays heat • Mode clearly from - Free postage - New and Used
360 indicator light • Ring displays heat • Mode clearly from - Free postage - New and Used
Nicrew slim aquarium filter - nicrew, - £15.99
Discover more from • Nicrew slim compact • Design hardly noticeable - Free postage - New and Used
Discover more from • Nicrew slim compact • Design hardly noticeable - Free postage - New and Used
50l turtle tank glass - turtle, - £59.99
Discover joy creating • Delightful haven your • Pawhut turtle tank - Free postage - New and Used
Discover joy creating • Delightful haven your • Pawhut turtle tank - Free postage - New and Used
Fish tank with - fish, - £89.10
Fish tank fishes • Sale binley coventry • Comes working filter - Free postage - New and Used
Fish tank fishes • Sale binley coventry • Comes working filter - Free postage - New and Used
Pond koi filter media bio - media, cell - £69.99
All one pond • Pump sterilizer foams • Solutions cup 129 - Free postage - New and Used
All one pond • Pump sterilizer foams • Solutions cup 129 - Free postage - New and Used
Nicrew slim aquarium filter - slim, - £15.26
Slim compact design • Hardly noticeable tank • Great choice nano - Free postage - New and Used
Slim compact design • Hardly noticeable tank • Great choice nano - Free postage - New and Used
Tetratec air pump tetra tec - tetratec, - £18.99
Aquarium best results • Position pump outside • Away from splashing - Free postage - New and Used
Aquarium best results • Position pump outside • Away from splashing - Free postage - New and Used
Efficient fish tank - efficient, - £26.95
Ideal 20l aquariums • Transform your aquarium • Into thriving aquatic - Free postage - New and Used
Ideal 20l aquariums • Transform your aquarium • Into thriving aquatic - Free postage - New and Used
Aquarium 50w 500w digital - to, - £18.47
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Nicrew slim aquarium filter - nicrew, - £17.01
Slim compact design • Hardly noticeable tank • Great choice nano - Free postage - New and Used
Slim compact design • Hardly noticeable tank • Great choice nano - Free postage - New and Used
120w 12v aquarium water - 12v, - £42.22
Cooling capacity can • Used water below • 120w cooler suitable - Free postage - New and Used
Cooling capacity can • Used water below • 120w cooler suitable - Free postage - New and Used
Tropical aquarium fish tank - aquarium, - £18.32
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Power 50w 100w • 200w 300w 500w • Fish tank aquarium - Free postage - New and Used
Try this: 3 foot aquarium | 3ft fish tank stand | 3ft tank | 4 foot aquarium | 4ft fish tank | 4ft fish tank stand | 50 litre fish tank | 5ft tank | 8ft fish tank | acan coral
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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 48 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 £6.39, while premium listings can reach £159.99 — giving you a wide budget spread to work with. The average price of £43.27 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.