Aquarium Air Stone Diffuser Online

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Air Stones


Simply put, air stones for aquariums add oxygen to the water and assist in circulating water around your tank. They are inexpensive and come in a variety of shapes and sizes. When attached to an air pump, they produce tiny bubbles which rise to the surface of your aquarium.


Ball Air Stones


  • Shaped like a round ball and are great for all-sizes of tanks.
  • Very versatile and the most common type of fish tank air stone used.
  • We stock 2.5cm, 4cm and 5cm sizes.


Cylinder Air Stones


  • Shaped like a cylinder and are also very commonly used.
  • Can be placed vertically or horizontally.
  • The range of Aqua One cylinder air stones are a popular choice.


Air Discs


  • Air discs lie flat like a coin and provide a round column of bubbles.
  • Place air discs under aquarium ornaments and rocks to create a unique look.
  • Check out our range of air discs.


Flexible Air Stones and Bubble Air Curtains


  • Flexible air stones can be bent and curved to a desired shape.
  • Often used to create a wall of bubbles at the back of the aquarium.
  • Flexible air stones are also known as aquarium air stone curtains.
  • Aqua One Flexible Air Stones are a popular choice.
  • The longer the flexible air stone, the larger the air pump has to be to get the desired effect.


Other Shapes


  • Stick air stones are usually buried in the gravel and provide a line of bubbles.
  • Can come in star or shell shapes; purely for decorative purposes.


How Do Air Stones Work?


The job of a fish tank air stone is to release tiny bubbles to gradually diffuse air into the aquarium. Air stones also minimise the noise of the air bubbles. Without an air stone, the air tubing will usually float to the surface of the tank. The bubbles coming out of the air tubing can also be quite large and very loud.


Do Air Stones Need a Pump?


For an air stone to expel bubbles, it needs to be connected to an air pump via some airline. Aquarium air stone setup is easy. Simply affix the air stone to the air tube attached to the air pump. Keep in mind, longer air stones need larger capacity air pumps to operate. You may also need a check valve in between to stop water backflow in the event of a power failure.


Where Should I Place My Air Stone?


It’s a personal preference on where aquarium air stones are placed. They are weighted so they won't float. It is best to place the air stone where there is the least amount of water flow and away from filter intake pipes. This is because bubbles rising up into the intake pipes can cause the filters to stop working. We like to bury air stones in the gravel, under an aquarium ornament or rock, or you can leave them in the corner of the tank. It’s completely up to you where you’d like to place the air stone.


Do I Need an Air Stone?


If you have a fish tank air pump, you will typically need an air stone unless you are using the air pump to connect to an internal sponge filter or air-operated aquarium ornament. Not all tanks will require an external source of bubbles. Air stones are usually not used in planted tanks because as bubbles dissolve and break down, they reduce the carbon dioxide in the water which is necessary for plant growth. Aquarium plants will produce oxygen for your fish.


When Do I Need to Replace an Air Stone?


Replace air stones when they start to break down, get covered in algae, or when the bubbles are not coming out evenly throughout the air stone. This will typically occur every couple of years.


Air Stones and Curtains at Aquarium Kingdom


We have lots of air stones for sale here at Aquarium Kingdom. Feel free to browse through the different shapes and sizes in our range. You can even create a beautiful bubble curtain aquarium look by using flexible air stones or add colour to your tank with an LED bubble curtain.


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