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Originally Posted by aquabillpers
High pH reduces the amount of CO2 that water can hold. Above 8.0 it greatly reduces the kinds of plants that can be maintained.
This is very significant in non-injected tanks.
Bill
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So why do high pH conditions cause plants to grow better if you do not inject CO2?
Here's a hint:
Does hard water have the same or less CO2 than soft water(two glasses sitting on the table full of water, no added CO2)?
Next question, can plants use HCO3-, the bicarbonate ion? Now which glass of water has more HCO3-?
Now add those two together for your answer.
Which has more carbon(the sum of CO2 and HCO3) for the plant under these non CO2 conditions?
Regards,
Tom Barr