Do I Need an Air Pump in My Aquarium?

Luca Toal
Do I Need an Air Pump in My Aquarium?

Do I Need an Air Pump in My Aquarium?

Short answer: not every aquarium needs an air pump, but many tanks can benefit from one. If your filter already creates good surface movement, you may already have enough oxygen exchange. An air pump becomes particularly useful when water movement is low, temperatures are high, you have a heavily stocked aquarium, or you want to run sponge filters and air stones.

What Does an Aquarium Air Pump Actually Do?

A common misconception is that the bubbles themselves are what put oxygen into the aquarium.

Most oxygen exchange actually happens at the water's surface. An air pump pushes air through an air stone, diffuser or sponge filter, creating bubbles and water movement. This disturbs the surface and helps oxygen enter the water while allowing carbon dioxide to escape.

So the main benefit of an aquarium air pump is improved circulation and surface agitation.

Do I Need an Air Pump if I Have a Filter?

Not necessarily.

If your aquarium filter is creating plenty of movement at the surface, an additional air pump may not be required.

However, we commonly recommend adding extra aeration when:

  • The aquarium is heavily stocked with fish

  • There is very little surface movement

  • You are running a sponge filter

  • The water temperature is high

  • Fish are showing signs of low oxygen

  • You want additional circulation

  • You have multiple aquariums or a fish room

Extra aeration can also provide a useful bit of redundancy alongside your normal filtration.

What Is the Best Quiet Aquarium Air Pump?

If noise matters, EHEIM air pumps are our preferred option.

They cost more than many basic aquarium air pumps, but you're paying for better build quality and much quieter operation.

The EHEIM air range includes the EHEIM air100, air200 and air400, allowing you to choose a model to suit different aquarium sizes and airflow requirements.

EHEIM specifically designs these pumps for quiet operation, and they also use vibration-resistant rubber feet to help reduce unwanted movement and noise.

For an aquarium in a lounge, bedroom or other quiet part of the house, we'd generally choose an EHEIM air pump over a cheaper option.

What Air Pump Should I Use for a Fish Room?

Fish rooms are a different story.

Instead of running a separate small air pump on every aquarium, many fishkeepers use a larger air pump connected to a manifold, allowing one pump to supply multiple sponge filters and air stones.

We regularly sell larger air pumps and pond-style air pumps to customers building fish rooms for exactly this reason.

The Aqua One O2Plus range is a great option when you need plenty of air without spending EHEIM money on every tank.

They can be a little noisier, but in a dedicated fish room that usually isn't a major issue. Most fishkeepers with a room full of tanks already expect some background equipment noise.

How Do I Make My Aquarium Air Pump Quieter?

A lot of air pump noise actually comes from vibration transferring into the cabinet, shelf or floor.

One of the easiest tricks is:

Place the air pump on a folded towel, foam pad or another soft surface that can absorb vibration.

Also check that:

  • The pump isn't touching the aquarium glass

  • Airline isn't pulling tightly against the pump

  • The pump isn't vibrating against a wall or cabinet

  • The air stone isn't blocked and creating excessive back pressure

Sometimes moving an air pump just a few centimetres or putting something soft underneath it makes a surprisingly big difference.

Do Planted Aquariums Need an Air Pump?

Not always.

A planted aquarium with adequate filtration and good surface movement may have absolutely no need for an additional air pump.

In high-tech planted aquariums using injected CO₂, excessive surface agitation during the day can actually cause CO₂ to escape from the water more quickly.

Some planted tank owners therefore run additional aeration only at night.

Can Fish Survive Without an Air Pump?

Absolutely.

Fish don't specifically require an air pump, they require enough dissolved oxygen in the water.

An aquarium can maintain excellent oxygen levels through filtration and surface movement without ever using an air pump.

The important thing is making sure the aquarium has adequate gas exchange for the number and type of fish you're keeping.

Which Aquarium Air Pump Should I Buy?

For most home aquariums, our recommendations are fairly simple:

Want the quietest, highest-quality option?
Go with an EHEIM air100, air200 or air400 depending on how much airflow you require.

Want a practical and affordable air pump?
The Aqua One O2Plus range is a great choice.

Running multiple aquariums or a fish room?
Consider a larger air pump or pond air pump connected to a manifold rather than running individual pumps on every tank.

If you're unsure what size air pump you need, contact Simply Fish or come and see us in Christchurch. Tell us your aquarium size, how many tanks you're running and what you want to power, and we can help match the right air pump to your setup.

Frequently Asked Questions

Do all fish tanks need an air pump?
No. If your filter provides enough surface movement and oxygen exchange, an additional air pump may not be necessary.

Does an air pump add oxygen to an aquarium?
Indirectly. The bubbles create circulation and surface agitation, which improves gas exchange and helps oxygen enter the aquarium water.

Can I leave my aquarium air pump running 24/7?
Yes. Aquarium air pumps are commonly operated continuously.

What is the quietest aquarium air pump?
We rate the EHEIM air range highly for quiet operation, reliability and build quality.

Can one air pump run multiple fish tanks?
Yes. A sufficiently powerful air pump can be connected to a manifold and used to run multiple sponge filters or air stones, which is common in fish rooms.

How can I stop my air pump vibrating?
Place it on a towel, foam pad or other soft surface and make sure it isn't touching the aquarium, wall or cabinet.