How pH changes over a 24 hour period in a freshwater aquarium

Before we discuss how pH changes over a 24 hour period in a freshwater aquarium we must say that the ph level of the water is directly influenced by the amount of carbon dioxide dissolved in water. So to change the pH level we must change the carbon dioxide level.

Day

Fish and other animals from a freshwater aquarium are producing Carbon Dioxide (CO2) which is used by plants for photosynthesis, in this process plants are producing oxygen, you can see small oxygen bubbles coming out of the plant.
The CO2 produced by living organism from a freshwater aquarium is less than the needs of the plants and the level of carbon dioxide starts to drop and the pH level starts to increase.
Tips: It is a good thing not to inject oxygen during the day in a freshwater aquarium.

Night

During the night plants stop photosynthesizing which means that the plants continue to breathe but the process is reversed, plants respire oxygen and are producing carbon dioxide which accumulates during the night, as carbon dioxide builds up the pH level decreases.
Tips: During the night is a good thing to inject oxygen in aquarium because fish and beneficial bacteria breathe oxygen.

To better understand how pH changes over a 24 hour period in a freshwater aquarium all you have to know are the following things:
• If Carbon Dioxide level is dropping the pH level is rising.
• If Carbon Dioxide level is rising the pH level is dropping.
To control the PH fluctuations from a freshwater aquarium you can use a PH Controller with a CO2 system.