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Originally Posted by Tom Barr
No, there are many many plants that use bicarb. Myrio's, Swords, Egeria, Hydrilla, all pondweeds, vals, sag's that's not a few..........
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That's not a few, I agree, but as a percentage of all aquarium plants? Maybe 5% (to pick a number) can use bicarb directly AND thrive?
I think the consensus is that crypts in general, for example, cannot use bicarb. But I've also read postings from people who say that they have done this, so . . . ?
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From the pH/KH table=>
pH 7 and a KH of 1=> 3ppm CO2
pH 8 and a KH of 10 => 3ppm of CO2
They have the same CO2 and both are at about ambient levels.
Which has more *total* carbon?
The one with the higher pH.........now why?
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Yes, I see that, but if the carbon in the bicarb is not useable by the plants that one is trying to grow, of what use is it?
Maybe a better question is, "What plants cannot grow in a high pH/low CO2 environment, without special measures like very high levels of lighting and ferts?"
Bill