"dirt substrate..no CO2 needed even under high light? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 07-14-2013, 04:34 PM Thread Starter
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"dirt substrate..no CO2 needed even under high light?

Is there any scientific truth to that statement? One of the members over the Low Tech Tank section claims that you can have over 7wpg and no CO2 is even needed...just because the dirt substrate can manufacture its own CO2, carbon source....


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post #2 of 6 (permalink) Old 07-14-2013, 05:28 PM
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I had to take one of my CFL's off of my 20g high dirt tank do to algae issues. It cleared up in a bout a week of reducing the light so I would say no. In addition adding diy co2 and Glut has cleared up all the dust algae and the tank is very clear.
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post #3 of 6 (permalink) Old 07-16-2013, 04:32 PM
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Soil substrates are good for nutrients and plant roots, but adding CO2 is necessary under high light. It does't hurt to use it on soil based tanks under low light either.

I've never regretted over engineering a system, but often regretted under engineering one.
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post #4 of 6 (permalink) Old 07-16-2013, 06:11 PM
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false. the soil does not add the required co2 to the water that high light tanks need.

I did have a high light soil tank as my first... and holy crap was growth explosive in the beginning.


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post #5 of 6 (permalink) Old 07-16-2013, 10:01 PM
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It depends, 7 wpg of what? What size tank? I have about 4 WPG in a semi dirted tank, have had up over 7 WPG. 6 Gallon tank, CFL bulbs, not really the same as say a 20 gallon with 140 Watts of T5HO.

In my experience, I have only had success with dirt in low tech tanks to begin with. I find I have the same issues with light (or no issues) if it has dirt or not.

-Matt

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post #6 of 6 (permalink) Old 07-23-2013, 02:11 PM
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there is some portion of truth in that statement if substrate contains bio material that is not fully decomposed. in that case substrate material keeps decomposing producing co2 as byproduct.
produced co2 volume however might turn out negligible
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