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I had an idea that most plants seem to grow better and faster emersed than submersed because they have a unlimited co2 pool. What if I tried to simulate this infinite co2 pool by just saturating the water with lots of air?
If I were to say, run a air pump, turn it to full power, to the point that you can see little tiny air bubbles everywhere in the tank, would the plants be able to extract their co2 supply from the tiny air bubbles?

Just a theory, because I really dislike messing with co2.
Thanks for any replies :icon_roll:icon_roll
 

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If you dislike messing with CO2 injection you might want to try liquid carbon, such as Easy Life. Its suitable for most plants plus has an anti algae effect. Cheaper too.
 

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Merely aerating a tank to keep the CO2 concentration the same as air, and replace CO2 as fast as it's depleted, doesn't require many bubbles and is quite easy.

Unfortunately, CO2 moves 10,000X slower through water than in air, which means that very little of it actually ends up touching plant leaves where it can be absorbed. That's why you need both high concentrations and high flow to get a submersed plant even a fraction as much CO2 as it can get from air.

What you're suggesting could work, but only if a significant portion of leaves are in actual contact with air bubbles at any moment. Which would require a frothing boiling mess o' bubbles, not a fizz. ;)
 

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I had an idea that most plants seem to grow better and faster emersed than submersed because they have a unlimited co2 pool. What if I tried to simulate this infinite co2 pool by just saturating the water with lots of air?
If I were to say, run a air pump, turn it to full power, to the point that you can see little tiny air bubbles everywhere in the tank, would the plants be able to extract their co2 supply from the tiny air bubbles?

Just a theory, because I really dislike messing with co2.
Thanks for any replies :icon_roll:icon_roll
When Tom Barr first proposed the CO2 mist idea, one of the advantages was that the gaseous CO2 would be in contact with the plant leaves, and that would make CO2 more available to the plants than when it is dissolved in the water. The CO2 mist idea worked great, but it did require that you accept the water being filled with microscopic bubbles all of the time.

If you were to run the air through a needle-wheel modified powerhead, the bubbles would be chopped up into microscopic bubbles with a small percentage of CO2 in each bubble. Those bubbles collecting under the leaves should increase the availability of CO2 to the plants. It might be a trivial increase and do no good, but it would be an interesting experiment to try.
 

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Children Boogie
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HD and Dark Cobra are right. The density of water does not allow CO2 to be absorbed very well by plants. You need 10x the amount (concentration) of CO2 available in the air going into the water column. So using plain atmospheric air is not a viable option. If that was the case, we'd all do it.

You can always set up a low tech dirt tank if you don't want to mess with CO2. The bacteria and other fauna in your tank will produce enough for plants in lower light situations.
 

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When Tom Barr first proposed the CO2 mist idea, one of the advantages was that the gaseous CO2 would be in contact with the plant leaves, and that would make CO2 more available to the plants than when it is dissolved in the water. The CO2 mist idea worked great, but it did require that you accept the water being filled with microscopic bubbles all of the time.

If you were to run the air through a needle-wheel modified powerhead, the bubbles would be chopped up into microscopic bubbles with a small percentage of CO2 in each bubble. Those bubbles collecting under the leaves should increase the availability of CO2 to the plants. It might be a trivial increase and do no good, but it would be an interesting experiment to try.
I agree with the mist method. Ive tried reactors in different forms and my plants do grow better by a small amount with a mist..
This measured over a month i averaged maybe 1/2 inch growth difference.. im running more light now, it may be even more. But there is a difference
 

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HD and Dark Cobra are right. The density of water does not allow CO2 to be absorbed very well by plants. You need 10x the amount (concentration) of CO2 available in the air going into the water column. So using plain atmospheric air is not a viable option. If that was the case, we'd all do it.

You can always set up a low tech dirt tank if you don't want to mess with CO2. The bacteria and other fauna in your tank will produce enough for plants in lower light situations.
Converting air into a mist of microscopic bubbles, which don't float rapidly to the surface is a relatively new idea. I'm not at all sure that many people have tried that as a source of CO2. In any case it is an easy cheap thing to try, just out of curiosity, if nothing else.
 

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Converting air into a mist of microscopic bubbles, which don't float rapidly to the surface is a relatively new idea. I'm not at all sure that many people have tried that as a source of CO2. In any case it is an easy cheap thing to try, just out of curiosity, if nothing else.
Ive tried it, with a toms wood diffuser and a rio pump. The mist does fill the tank. There was no noticeable growth difference over a 6 week period before the wood became mush.
I did notice a lot of the bubbles would shrink in size so something was dissolved,
The growth rate may not have changed due to i had excessive low light with a modified marineland singlebright by added led's
 

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Children Boogie
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Converting air into a mist of microscopic bubbles, which don't float rapidly to the surface is a relatively new idea. I'm not at all sure that many people have tried that as a source of CO2. In any case it is an easy cheap thing to try, just out of curiosity, if nothing else.
It's worth a try but probably won't raise co2 all that much. Bacteria would probably do a better job. You'd need equipments to measure co2 levels. We can't depend on "eyeing it" in experiments.

There are cases where water output from dams stories high would cause air to mix so much that would cause fish to have the bends but that's huge volumes of water and energy. You're likely to inject more nitrogen than co2 as mentioned already.


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Ive tried it, with a toms wood diffuser and a rio pump. The mist does fill the tank. There was no noticeable growth difference over a 6 week period before the wood became mush.
I did notice a lot of the bubbles would shrink in size so something was dissolved,
The growth rate may not have changed due to i had excessive low light with a modified marineland singlebright by added led's
My experience is that, for low light tanks, relatively small injections of CO2, by the DIY method, can cause dramatic increases in plant growth rates. If your experiment showed no noticeable growth rate difference it is very likely that this is not effective enough to be worth trying again. My guess is that the tiny amount of CO2 in each air bubble isn't enough to help the plants even when the bubble is lodged against a leaf. Alternatively, the CO2 quickly dissolves into the water, just barely increasing the ppm of CO2 in the water, and the bubble that sticks to a leaf is all nitrogen and oxygen.
 

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My experience is that, for low light tanks, relatively small injections of CO2, by the DIY method, can cause dramatic increases in plant growth rates. If your experiment showed no noticeable growth rate difference it is very likely that this is not effective enough to be worth trying again. My guess is that the tiny amount of CO2 in each air bubble isn't enough to help the plants even when the bubble is lodged against a leaf. Alternatively, the CO2 quickly dissolves into the water, just barely increasing the ppm of CO2 in the water, and the bubble that sticks to a leaf is all nitrogen and oxygen.
there were deffinitely tons of bubbles on leaves. tops and bottoms. but no growth changes
 

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Discussion Starter #18
Aww so I guess it's not going to work, thanks everyone for replying. I guess I'll just work with DIY co2 :( as I'm trying to grow moss
 
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