We can intuitively see a problem with low oxygen supply, as we know that oxygen is essential for respiration and consequently, life. But can oxygen in a tank be too much for our fish tank buddies?
Does Temperature have any effect on oxygen concentration?
The higher the temperature in your aquarium, the lower the oxygen content in the aquarium because cold water can hold more dissolved oxygen than warm water. The oxygen that fish breathe is essentially the same atmospheric oxygen that we humans breathe; but, when it comes into contact with water, it dissolves into it, much the same way salt does.
How does aeration affect oxygen supply?
Aeration is the introduction of oxygen into the aquarium ecosystem. It occurs naturally at the water surface, so the wider the surface area of your aquarium, the more natural aeration it will have. You can provide aeration in the tank using devices like filter, air stones and power heads. Circulation is an important part of aeration because it moves water from the bottom to the surface to pick up oxygen and release carbon dioxide.
Can circulation be too much?
Yes. If you see your fish being whisked around the aquarium or see them greatly struggling, you need to reduce the amount of circulation. Tolerance to water movement depends on fish species. Some species like bettas prefer still waters so a small current may not be ideal for them.
Can oxygen be too much in the tank?
Too much oxygenation can occur in the tank if liquid oxygen or pure oxygen were injected into the tank. Bubbles form in the side of the tank (this is super saturation). Too much oxygenation can cause a potentially fatal condition to your fish called gas bubble disease. Affected fish develop bubbles in their skin and around their eyes.