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This article is from the Aquaria: Plants FAQ, by multiple authors.

20 How much Carbon Dioxide (CO2) is normal?

The optimum dissolved CO2 level in an aquarium is 15-20 ppm. Some
references say that levels above 25ppm poison your fish, but general
experience is that this doesn't happen. The amount found in the water
from atmospheric concentrations varies by elevation and temperature,
but is less than 1ppm.

 

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aquaria, fish, acquarium, tank, plant, light, CO2, fertilizer