What is the main function of the electricity bulb provided in the aquarium?

How are the plants of the aquarium getting carbon dioxide to prepare their food?

1. The light coming from the bulb is essential to sustain photosynthetic life in the aquarium.

2. When any organic material such as  leaves, dead animals rot or decompose or when calcium carbonate rocks undergoes weathering,  release of carbon dioxide occur in the ocean . 

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from water animals aquatic plants get carbondioxide
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