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Carbon dioxide 

During respiration oxygen is used up and carbon dioxide is produced. Carbon dioxide is important for healthy plant growth in the aquarium as plants use carbon dioxide for photosynthesis. Carbon dioxide systems are often added to aquariums, these systems release a regulated amount of carbon dioxide gas into the aquarium to act as a fertiliser. 

 

The effects of carbon dioxide in aquariums The effects of carbon dioxide in aquariums The effects of carbon dioxide in aquariums
The effects of carbon dioxide in aquariums The effects of carbon dioxide in aquariums The effects of carbon dioxide in aquariums
The effects of carbon dioxide in aquariums The effects of carbon dioxide in aquariums The effects of carbon dioxide in aquariums

The level of carbon dioxide in the water will have an effect on the pH level as carbon dioxide produces carbonic acid, which will lower pH. Removal of carbon dioxide will raise pH. Agitation of the water surface will dissipate carbon dioxide and this should be avoided in planted aquariums.

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