Used fish tanks in the UK typically sell for £20 to £150 (about $27 to $200). An empty tank is bought on volume, dimensions and the state of the silicone — it is a simpler sale than a full setup, and it lives or dies on whether the seals are sound.
What fish tanks are worth in the UK
| Condition | Typical | What it means |
|---|---|---|
| New with Tags | £150 | Unused, tags or seals intact |
| Like New | £128 | Barely used, no visible wear |
| Good | £98 | Light signs of use, complete and working |
| Fair | £68 | Heavily used, or a described fault or missing part |
| For Parts | £38 | Not working or incomplete, sold as seen |
Guide ranges converted from sterling at the 2 August 2026 rate, not quotes — sellers set their own price. Grades are seller-declared; WishThrift does not inspect or verify them.
What lifts the price
- Complete setups with filter, heater and light
- Seals with no lifting at the corners
What pulls it down
- Chips at the corners, which risk failure
- Scratched acrylic
Selling a fish tank in the UK
Most private sales settle by bank transfer or cash on collection. Faster Payments clear in seconds, which makes a transfer as safe as cash for the seller — wait for it to land before the item leaves your hands.
Royal Mail, Evri and InPost cover the whole country, and InPost lockers mean neither side has to be in for a delivery. Tracked 48 is the usual default for small parcels.
Distance selling rules bind traders, not private sellers, but an item must still be as described and anything sold as working must actually work.
Second-hand demand peaks in January, in the weeks before Christmas, and at the start of the academic year in September.
Working out what yours is worth
- Fill it outdoors and leave it standing to test for leaks
- Run a fingernail along every seam
Getting it ready
- Fill it and leave it standing for several hours on a flat surface, then check every seam for weeping.
- Clean off limescale tide marks with an aquarium-safe method, and check the glass for scratches by feel as well as sight.
Photograph
- The empty tank straight on, on a plain surface, in good light
- The base and edges, showing chips or scratches
- The lid, hood or brace bars if included, plus any damage
Put in the description
- Volume in litres and exact external dimensions
- Glass thickness if known, and whether it is braced or rimless
- Age of the tank and whether the seals have been water tested
Volume and dimensions: “120L Glass Fish Tank, 100x40x40cm, Empty”. Say empty or bare in the title so buyers do not arrive expecting equipment — if yours includes filter and heater, it is a setup and belongs in the aquarium guide instead.
Collection, empty and dry. Carry it flat and supported underneath, never by the rim or on edge, and never with substrate or water inside — that is how tanks crack in transit.
It costs nothing to list
There is no listing fee, no selling fee and no commission, so the £150 a buyer pays is the £150 you keep. You and the buyer settle up and arrange the handover between yourselves; WishThrift does not hold the money or ship the item.
Where in the UK
The United Kingdom is a big place and what sells well moves with it. These are the parts of the United Kingdom with their own page for fish tanks.
Common questions
Where can I sell a fish tank in the UK?
List it free on WishThrift and deal with the buyer direct. There is no selling fee, so the whole amount stays with you. Most private sales settle by bank transfer or cash on collection. Faster Payments clear in seconds, which makes a transfer as safe as cash for the seller — wait for it to land before the item leaves your hands.
Is it scratched?
Run a fingernail over any mark. Scratches you can feel are in the glass and permanent; surface film cleans off. Photograph anything significant.
Should I leak test a fish tank before selling?
Yes. Fill it outdoors and leave it standing for a few hours. It is the single most reassuring thing you can tell a buyer.
Do complete setups sell better?
Much better, because a beginner needs everything at once and a complete tank saves them sourcing each part.
More: how to sell a fish tank, what fish tanks are worth, or Pet Supplies across the United Kingdom.