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Natural source for CO2


djayz
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Add more fish. They all exhale CO2. (Well in as much as fish exhale).  Adding more aeration might help also. Air has more CO2 in it than aquarium water. Which is why commercial aquarium plant producers grow plants emersed. If you throw enough air in, the water should absorb more CO2 from the air. I've been intrigued by the idea of putting an air stone under a plant so it gets bathed in air, potentially exposing it to more CO2 than the water could absorb. Think of it as a semi-emersed system. It might not work because emersed growth is different from submerged, but it might work. You'll want a plant well anchored or rooted though if you try that. The air will want to lift it. More fish, more air, both should get you more CO2 in the water. Not as much as you'd get from CO2 injection, but maybe enough to make a difference.

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