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I started an El Natural tank based on Ms. Walstad's method. Initially, I had a CO2 bottle. However, it will either drain the nutrients in the substrate at a faster rate based on the available light or you're end up with a lot of algae. When you're doing low-tech, it's better to not introduce CO2, especially if you're not adding fertilizer and keeping the light at 2 wpg.

regards,
Ravi
 
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