Monday, September 23, 2013

Oxygen in your Aquarium


Oxygen in your Aquarium 

Oxygen is vital to the fish and animal population of the aquatic environment. It is made available in the water via three different avenues—surface gas exchange with the atmosphere, surface agitation, and photosynthesis. Surface agitation can be achieved using external aeration tools such as aerators or filters.

Recommended Oxygen in Aquarium Tanks

To maintain plant and fish health, oxygen levels should not be below 60% of saturation, that is, about 5 mg/L. A 25% saturation (2 mg/L) will spell disaster for the fish population. Take note that these figures are applicable only for freshwater tanks. Seawater tanks have lower saturation points. For optimal oxygen content, freshwater should measure about 8.3 mg per liter of oxygen while saltwater should test out slightly lower, between 6.4 and 7.0 mg per liter of oxygen, when water is kept at 77°F.


Oxygen is important for respiration of fish. When levels of oxygen drop below 2 ppm, the resulting conditions can be deadly for fishes and many cannot survive at very low oxygen levels.

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