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I was under the understanding that the longer the co2 was in the water the more that it would dissolve into it. If you place the co2 line next to or connected to the power head does the co2 stay in the water long enough to dissolve.
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I am not sure how in vogue it is anymore, but around spring/summer of 2006 the rage was CO2 mist. (This was another Plantbrain/T. Barr concept many folks tried on their tanks for experimentation.) While we of course want dissolved CO2 at our target ppm, the idea with CO2 mist was to circulate undissolved CO2 to our plants, where each sphere/bubble/"piece of mist" would have the opportunity to dissolve closer to the target plants.
The problem is mist tends to make the tank look turbid/cloduy, just as a high pearling/streaming tank will, but of course the powerhead to target mist makes it less natural. Some folks claimed that the great growth others saw was really gas saturation near the plant, and the same could be acheived simply with good current and plenty of dissolved CO2. Other folks thought all mist does is make better fake pearling (like after a water change) pictures. But yet others found some of their previous problem plants suddenly grew well in mist, while also finding node density on their stems (the amount of space between leaf nodes) increased (more leaves per section of stem), which of course is desireable when you want to build little bushes and groupings. (I am one of these latter people and a fan of CO2 mist.)
Yet other folks do find benefit in CO2 mist but find it difficult to reach saturation or find they want to targtet mist to several parts of the tank. For these folks two reactors or more, be they a combination of total diffusion (bubble/ball reactors) or mist (a powerhead to chop or direct CO2 bubbles).
Just more methods to consider. Lots of roads to the same end, as you know.