Any Benefits of CO2 Levels in Excess of 30 ppm? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 11-23-2004, 10:45 PM Thread Starter
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Any Benefits of CO2 Levels in Excess of 30 ppm?

I've always wondered if plants can take advantage of CO2 levels above 30 ppm. I just saw a recent post by Ibn in which he says that he runs his CO2 at a constant 43 ppm. Now I'm beginning to wonder . . . Is CO2 recommended to be kept below 30 ppm simply because of the fauna one might keep in the aquarium, or is it the upper limit for plant absorbtion? Thanks!

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post #2 of 4 (permalink) Old 11-24-2004, 01:49 PM
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I've personally only experienced an outbreak of hair algae with C02 levels above 30ppm with macro's in the range of:
N03 5-10
P04 0.4-1.0+
CSM+B Daily
Flourish Iron- 2ml week

Craig

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Last edited by WfxXx; 11-24-2004 at 01:50 PM. Reason: pre-coffee type-o
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post #3 of 4 (permalink) Old 11-24-2004, 02:02 PM Thread Starter
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Quote:
Originally Posted by W�f��xXx
I've personally only experienced an outbreak of hair algae with C02 levels above 30ppm with macro's in the range of:
N03 5-10
P04 0.4-1.0+
CSM+B Daily
Flourish Iron- 2ml week
I've done a little reading since my initial post and Tom Barr seems to agree with your observations - that is, if I understood his post correctly, which can be a tricky thing to do even in the best of times. He claims that CO2 levels above 30 ppm don't significantly increase plant growth and may actually select for algae. However, I also read that in SE Asia some crypts are found in waters containing CO2 levels near 75 ppm and are thriving. No mention of whether the algae in those 75 ppm waters was thriving as well

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post #4 of 4 (permalink) Old 11-24-2004, 04:04 PM
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Didn't really do it for the increase in the amount of CO2 in solution, but rather to bring the pH down. I actually had it higher (85 ppm) for awhile, but didn't keep it there for too long.

Haven't had problems with hair algae for awhile now (got some from Albany awhile back, which went away pretty quickly). Plants grow like weed in the high light and high fert tank (1ml of micro every day and macros every other). The crypts don't mind it at all either (turned a nice reddish coloration and were still putting out runners).

Running the same amount of CO2 in the 90 (set up since this weekend) and the fish and plants don't mind it at all. Some of the crypts started to melt, but I kind of expected it. I had just gotten them from another poster the previous week and the root/plant wasn't acclimated. Not all of them have melted either, just some.

Eric


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