How to Sell a Damaged Fish Tank

A damaged fish tank is still worth selling — typically £5 to £38 at For Parts, against £20 to £150 undamaged.

Can you sell a fish tank that is damaged?

Yes. Damaged stock has its own buyers: people who repair and restore, people who want the material rather than the object, and people who want a cheaper one and do not mind a flaw. Nobody should be surprised when it arrives.

The damage buyers look for on fish tanks

These are the flaws that move a fish tank down the grades, and the ones a buyer will check first:

Lifted or perished silicone seals
Chips at the corners, which risk failure
Scratched acrylic
Missing lids and light units

Before you list it

A tank with a chipped rim, a crazed pane or perished silicone can let go without warning when refilled. Sell it as a dry tank for a rebuild, and say plainly that it has not been leak-tested.

Grading it honestly

Fair covers something heavily used, or with a described fault or missing part: around £9 to £68. For Parts covers something not working or incomplete, sold as seen: roughly £5 to £38. Grades are seller-declared and nobody inspects them for you, so grading up does not raise what you get — it produces a buyer who arrives expecting something else. All five grades explained.

Working out what you actually have

Establish the flaw properly rather than guessing at it:

Fill it outdoors and leave it standing to test for leaks
Run a fingernail along every seam
Confirm the filter, heater and light work

Photographing the flaw

Photograph the damage directly and in focus — it is the evidence that the rest of the description is honest:

The empty tank straight on, on a plain surface, in good light
The internal corner seams close up, showing the silicone
The base and edges, showing chips or scratches
The lid, hood or brace bars if included, plus any damage

What to state in the listing

Alongside the flaw itself, buyers of damaged fish tanks want these confirmed:

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
Whether a lid, hood, light bar or stand is included

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.

What buyers will ask

Answer these in the listing rather than waiting to be asked:

“Have you tested it for leaks?”

Fill it, wait, and report what happened. An untested old tank is worth far less than a tested one because the buyer is carrying all the risk.

“How old is it?”

Give your honest estimate. Silicone has a working life, and buyers of tanks over about a decade old often plan to reseal as a precaution.

“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.

Is it worth repairing first?

Only where it is cheap and visibly well done — a clumsy repair costs more than the flaw it hides. What lifts the price:

Complete setups with filter, heater and light
Seals with no lifting at the corners
Larger volumes, expensive new
Stands and lids included

If the work would cost more than the gap between £38 and what a sound one fetches, sell it as is damaged and let the buyer decide.

When to list it

Steady year round with an autumn and January lift. Standard sizes sell within a couple of weeks; very large tanks are slower because few buyers have the floor for them.

Getting it to the buyer

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.

WishThrift does not process payments, arrange delivery or hold funds. Confirm the money has cleared before the item leaves your hands, and keep the conversation on the site so there is a record of what was agreed.

Ready to list it? Free to list, no commission, and neither side pays a buyer-protection fee — create a free account, or read the full fish tank selling guide if yours turns out to be sound.

Frequently asked questions

Can you sell a damaged fish tank?

Yes. A damaged fish tank typically is worth £5 to £38 against £20 to £150 undamaged, and there is a real market in repair, restoration and craft stock. Lifted or perished silicone seals

Is it worth repairing first?

Only where the repair is cheap and visibly done well. What buyers pay for is complete setups with filter, heater and light — a repair that draws attention to the flaw can leave you worse off.

How should I describe the damage?

Precisely, with a photograph of the flaw itself. Fill it, wait, and report what happened. An untested old tank is worth far less than a tested one because the buyer is carrying all the risk. Vague wording is what produces the message asking for a refund.