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

19 Isn't Carbon Dioxide (CO2) expensive?

The startup cost can be a bit steep; expect to pay around $500 for a
fully-automated Dupla system, $350 for a manual injector. If you do it
yourself using welding or bar supplies, you can drop the price to
$100-$200 for a tank, regulator, and needle valve. After your initial
investment, CO2 refills (try fire extinguisher or beverage service
outlets) are cheap: $5-10 a year for a 5 lb cylinder.

If this is still too much, try the ultra-cheap Yeast Method of brewing
CO2 (see below).

 

Continue to:

• prev: 18 Is Carbon Dioxide (CO2) injection really necessary?
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• next: 20 How much Carbon Dioxide (CO2) is normal?

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