Aquarium Aeration and oxygenation

Aeration is the introduction of oxygen into your aquarium ecosystem. It occurs naturally at the water's surface, so the more surface area your aquarium has the more natural aeration it will have. Water movement and circulation oxygenate the water so that fish have the air they need to breathe and survive. In an aquarium, the surface of the water is significantly reduced. Therefore, artificial ways of oxygenating the water must be accomplished through aeration. Aeration is the process of adding oxygen via the air, while oxygenation is the process of adding pure oxygen to the water.

Measuring oxygen levels in Aquarium

The best way to test the amount of dissolved oxygen in your aquarium's water is with a portable dissolved oxygen meter. After calibrating the meter, you can place a probe into the tank water, and read the results on the digital display.

We can easily buy a Dissolved Oxygen Meter on Amazon.

A normal level of oxygen is usually 95% or Higher. Some people with chronic lung disease or sleep apnea can have normal levels of around 90%. The "Spo2" reading on a pulse oximeter shows the percentage of oxygen in someone's blood. If your home Spo2 reading is lower than 95%, call your healthcare provider.

If you're using an oximeter at home and your oxygen saturation level is 92% or lower, call your healthcare provider. If it's at 88% or lower, get to the nearest emergency room as soon as possible.

Best oxygen level- Oxygen saturation values are between 95% and 100% for most healthy individuals, but sometimes can be lower in people with lung problems. Oxygen saturation levels are also generally slightly lower for those living at higher altitudes.

Signs of too much, oxygen in a fish tank

The sign of too much oxygen in a fish tank are bubbles escaping the Surface and increased dissolved oxygen levels. Fish will also show abnormal swimming behavior, open-mouth breathing, excessive appetite, or lethargy. If left unchecked for too long, it can be fatal to the fish's health. Too much oxygen in water can lead to the potentially lethal gas bubbles disease, in which gas comes out of the solution inside the fish, creating bubbles in its skin and around its eyes.

What happens if there is too much oxygen in the fish tank?

Too much oxygen in water can lead to the potentially lethal gas bubble disease, in which gas comes out of the solution inside the fish, creating bubbles in its skin and around its eyes. (excess nitrogen, however, is a far more common cause of this disease). Gas bubbles are a disease of fish that are exposed to water supersaturated with natural gases like oxygen, carbon dioxide, or nitrogen. Bubbles of gas may form in the eyes, skin gills, and fins.


  • Eggs float to the surface and fish may show hyperinflation of their swim bladder.
  • Cranial swelling
  • Blindness
  • Swollen gill lamellae up to 100% of fish may die.

Small gas bubbles in fish can be prevented and somewhat cured by relocating fish into deep water that contains higher pressure and therefore a higher amount of gases can be dissolved in the water. This will cause nitrogen excess to be dissolved into the body tissues and the gas bubbles will eventually disappear.

How to cure too much oxygen in a fish tank?

Install an air stone or air bubbler near the surface of your aquarium that can emit bubbles into the water column. This will put out the excess oxygen from beneath scales on fish bodies and change up your lighting with fluorescent bulbs as they don't produce as many unnecessary wavelengths as other types such as LEDs.

How much oxygen should be in the fish tank?

The average saturation in an aquarium is about 70%. The Level of dissolved oxygen varies throughout the day. It is higher in the lighting period and has the lowest concentration in the early morning hours.

How do I manually add oxygen to my fish tank?

  • Stirring the water manually.
  • Adding ice cubes and using a fan
  • Pouring water from a height. The most simple way to increase oxygen and help aerate water in a fish tank is to slowly pour water from a height.
  • Using a battery-powered air pump. We can easily buy these products on Amazon.