if some aquatic plants requires co2, how do they exist in nature

user12345pk said:

if some aquatic plants requires co2, how do they exist in nature with a huge tank of co2 being pumped into the water?

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Usually by growing partially out of the water, where they can get that co2 from the air.

Shadar said:

Usually by growing partially out of the water, where they can get that co2 from the air.

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good example of this would be ludwigia

Also important to remember that atmospheric CO2 is always in balance with the water, and also that there biologic sources of CO2.

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The more CO2 a plant needs, the more likely it is to live only partially or temporarily submerged.