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That is what you want and you can see that, better than any test kit or ppm's reading. Flow can blow that off while still producing higher growth rates, thus you cannot tell as easily.
More growth is not always better, but I think a good visual cue it more important as long as algae and good over all tank health is good.
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So as long as their is lots of mist all about even though visual pearling is not seen until flow slows and DC remains blue, Co2 levels can be assumed good?