Not injecting co2. Aerate or not? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 01-27-2005, 06:24 PM Thread Starter
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Not injecting co2. Aerate or not?

So if you are not injecting co2, would it be better to have some surface agitation, or not? Wouldn't aerating the water add some c02 in this case?
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post #2 of 4 (permalink) Old 02-26-2005, 02:23 AM
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Surface agitation

I was thinking that same thing tonight about surface agitation.
You always read “Don’t agitate the surface, because you’ll lose the CO2.”

Especially when you have a low bio load and not injecting CO2 wouldn’t you get more CO2 from gas exchange on the surface?

Does surface turbulence only increase the O content and deplete the CO2? Or is there a more even exchange O and CO2 leaving and entering the water with surface agitated?

Does anyone know?

Last edited by Betta; 02-26-2005 at 02:29 AM. Reason: spelling error
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post #3 of 4 (permalink) Old 02-26-2005, 09:13 AM
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Breaking the water surface will help dissipate all gasses in and out of the aquaria.
CO2 does not saturate nearly as well into water as O2 does, therefore it is easier to drive out CO2.

Originally Posted by Aulonochromis
So if you are not injecting co2, would it be better to have some surface agitation, or not? Wouldn't aerating the water add some c02 in this case?
No, you're fish are respiring a slight amount of CO2 into the water and only a very negligable amount will dissolve from the air (see above). Without injecting more, this will be a very low amount for plants so you want to keep as much of that in the water as possible, therefore reduce agitation.

The only reason to increase agitation is if fish are gasping from too low O2 levels, which IMO means there is a serious stocking issue with your tank that needs to be addressed.


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post #4 of 4 (permalink) Old 02-26-2005, 01:07 PM
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I disagree, if the plants are removing CO2 from solution and there is a big sink of CO2 in the atmosphere above then aeration is the best way, short of CO2 injection to increase the CO2 in the aquarium. Its easier to attain equilibrium with the atmospheric CO2 through aeration.


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