Water type
Freshwater + Marine
Orca Small Round Air Stone
Fine bubbles that quietly boost oxygen and gentle flow. The Orca Small Round Air Stone connects to any aquarium air pump through standard airline tubing and breaks the airflow into a steady stream of fine bubbles. It suits nano to medium freshwater and marine tanks where you want extra surface agitation and gas exchange without adding a second powerhead.
Key features
- Fine-bubble diffusion – breaks pump air into a dense stream of small bubbles rather than a few large glugs, for better gas exchange at the surface.
- Round profile – sits flat and low on the substrate, easy to tuck behind rock or in a sump baffle.
- Standard 4 mm airline fitting – connects straight onto an Orca air pump or any other standard aquarium air pump.
- Fresh and saltwater safe – suits planted tanks, community tanks and marine sumps alike.
- Inexpensive to replace – air stones harden and clog with mineral deposits over time, so keeping a spare on hand is cheap insurance.
Specifications
| Shape | Round |
|---|---|
| Connection | Standard 4 mm airline tubing |
| Water type | Freshwater and marine |
| Power source | Requires a separate air pump (not included) |
Suitable for, and not suitable for
- Suitable for nano and standard aquariums, sumps and quarantine tanks needing extra surface agitation or gas exchange.
- Suitable for both fresh and saltwater setups.
- Not a substitute for a powerhead or return pump – it adds air movement, not water turnover.
- Not suitable for use without an air pump; it has no power source of its own.
Care and maintenance
Air stones lose output as mineral deposits build up in the pores. If the bubbles get coarse or uneven, soak the stone in fresh water and gently work the surface, or replace it – at this price, replacing is often quicker than cleaning.
Goes well with
- Orca Airline T-Piece White – splits one pump outlet to run this air stone alongside a second stone or ornament.
- Orca Airline Gate Valve – dials the flow down if the bubble stream is too strong for a nano tank.
- Orca Small Air Stone – a slimmer alternative shape if the round profile doesn't suit the spot you have in mind.
Warranty and delivery
Covered by your consumer guarantee rights under Australian Consumer Law in addition to any manufacturer warranty. Small and light – standard parcel delivery, no special freight handling required.
Common questions
Will this fit my existing air pump?
Yes. It connects to standard 4 mm aquarium airline tubing, which is what the great majority of air pumps sold in Australia use.
Can I use it in a saltwater tank?
Yes. It's safe for both freshwater and marine aquariums, including reef sumps.
Why has my air stone stopped bubbling evenly?
Mineral deposits and biofilm build up in the pores over time and restrict airflow. A worn stone is inexpensive to replace and usually the fastest fix.
Does it need its own power supply?
No. The air stone itself is passive – it only diffuses air already being pushed through it by a separate air pump.
