FitMatch

The Aqua One Betta Condo Duo takes the Aqua One Sponge 15ppi 312s (25312S) for Betta Condo Duo and Betta Condo Trio as its filter media; Australian sellers list it from A$10.88 as of 29 October 2026. Fitment confirmed against the manufacturer's compatibility list.

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Aquarium filter

Confirmed against Aqua One's list

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25312S

Takes the 25312S

Filter media · check the code on your old filter.

Other Aqua One aquarium filters that take the 25312S

Genuine

$10.88

Aquarium Spare Parts · 29 Oct

Compatible

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No compatible seller tracked yet

Genuine: made by Aqua One. Compatible: another brand.

Lowest price · $10.88

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This aquarium filter also takes a carbon filter

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AUD, before delivery. Each price shows when it was checked.

Aquarium Spare PartsGenuine · checked 29 Oct$10.88Open
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How long it lasts

Replace it when it clogs, breaks down or no longer holds its shape, Aqua One says; until then rinse it in a bucket of aquarium water each time you clean the filter.

How to change the filter media in your Aqua One Betta Condo Duo

Watch the guide or follow the steps.

No clear video for this part yet. The steps cover it.

  1. 1Unplug all the aquarium's equipment, then lift off the light unit and lid and put them somewhere safe.
  2. 2Open the filter compartment and take out the sponge and the cartridges (carbon, and ceramic if your tank has one).
  3. 3Take some water out of the aquarium and rinse the sponge and cartridges in it. Aqua One says never to rinse the sponge under the tap, as that kills the beneficial bacteria. If needed, siphon waste out of the filter chambers.
  4. 4Put the sponge back, or fit a new one once the old one blocks up or breaks down.
  5. 5Refit everything, replace the lid and light unit, check your hands and plugs are dry, then turn the power back on and check the equipment over the next half hour.
Every number this part goes by
Retail name:
25312S
Retail name:
312S

Sellers list any of these; they are the same part.

About your Betta Condo Duo

Aqua One aquarium filter — Betta Condo aquarium. Its filter media is the Sponge 15ppi 312s (25312S) for Betta Condo Duo and Betta Condo Trio, part 25312S.

Also in this aquarium filter: Aqua One Carbon Cartridge 1c (25001C) (every 2 months).

Where the model number is: The model is on the filter's lid, motor head or a label on its side (Fluval 307, Eheim Classic 2215). For a tank with a built-in filter, use the tank's name.

Fits these 2 Aqua One models
Common questions
Which filter media fits the Aqua One Betta Condo Duo?
The Aqua One Betta Condo Duo takes the Aqua One Sponge 15ppi 312s (25312S) for Betta Condo Duo and Betta Condo Trio.
Where can I buy the 25312S in Australia?
We track 1 Australian seller for the 25312S; the lowest listed price when we last checked was A$10.88 at Aquarium Spare Parts. Prices are re-checked daily and dated on this page.
How do I fit the 25312S in an Aqua One Betta Condo Duo?
No tools, a few minutes: 5 steps, listed on this page with the replacement video where the maker has one.
What happens if I don't change it?
Spent carbon stops removing odours and discolouration, and clogged pads slow the flow, so the filter moves less water through the tank.

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