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post #1 of 7 (permalink) Old 08-21-2004, 04:02 AM Thread Starter
mll
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co2

What happens if you got to much co2 in your tank?
could it kill the plants?
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post #2 of 7 (permalink) Old 08-21-2004, 05:41 AM
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No, but it can kill your fish.
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post #3 of 7 (permalink) Old 08-21-2004, 05:45 AM
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Ah, this topic is debatable. I've heard of instances where CO2 was over 100ppm. No fish died. Then I've heard where it has got to only 40ppm and the tank was wiped out (just fish). Though my experience and reading, it seems to me the CO2 concentration has nothing to do with fish dieing. Its the SUDDEN and LARGE pH swing that comes with overdosing CO2 that kills. The reason why some one was able to keep fish in water with over 100ppm was probably due to a very slow increase in pH, giving the fish time to adjust.

Anyway, 20ppm of CO2 is good. There really isn't any reason to go higher than 30ppm.
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post #4 of 7 (permalink) Old 08-21-2004, 09:33 AM
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I agree with you Chris.

Many people have the misconception that CO2 actually displaces O2 in the tank and that high levels of CO2 mean a lot less O2. From my various readings, this does not appear to be the case. I mean we are talking mg/l (ppm) here. At a CO2 level of 25ppm, how much O2 could be displaced by a 25 millionth concentration of CO2 in the water?

High CO2 by itself shouldn't kill the fish.
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post #5 of 7 (permalink) Old 08-21-2004, 11:20 AM Thread Starter
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Great, there will be no fish in this tank, only plants.
So high level of co2 wouldn't matter.
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post #6 of 7 (permalink) Old 08-21-2004, 09:52 PM
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I was curious too , at what level do fish croak. Also I cant get my PH BELOW 7, I can take it from 7.4 to 7 but no lower. ANYONE?
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post #7 of 7 (permalink) Old 08-22-2004, 01:46 PM
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Quote:
Originally Posted by jmiz16
I was curious too , at what level do fish croak. Also I cant get my PH BELOW 7, I can take it from 7.4 to 7 but no lower. ANYONE?
Bad test kit, bad CO2 diffusion method? That's about the only things that come to mind.
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