DIY CO2 in a 3 gallon - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 02-15-2008, 06:27 PM Thread Starter
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DIY CO2 in a 3 gallon

I just set up a 3 gallon betta tank, for which I want to use CO2 to kickstart growth. There's no real way for me to control ppm of CO2 in the tank, but since the only inhabitant is a betta, will it be safe even at high PPM as long as the pH doesn't change much?

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post #2 of 13 (permalink) Old 02-15-2008, 06:32 PM
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Well, adding co2 will lower the ph, but this is dependent upon the kh (buffering capacity). Also, the drop in ph from addition of co2 isn't really harmful for the fish. The high levels of co2 (ppm) will likely be harmful for any type of fish. You can try to adjust the mix you use for the DIY co2, to create a slower rate of production. There are some good threads around here about how to do just that. You can also increase surface movement/agitation to outgas the co2, which may help you keep the co2 in a reasonable range. HTH

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post #3 of 13 (permalink) Old 02-15-2008, 06:51 PM Thread Starter
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What I mean is a drastic pH drop. Since Bettas have a labyrinth and breathe air, I was thinking high levels of CO2 wouldn't harm the fish. I will definately monitor the tank closely

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post #4 of 13 (permalink) Old 02-15-2008, 07:25 PM
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The issue is usually low oxygen, and not so much the high levels of CO2. When it is dark, plants use oxygen too.

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post #5 of 13 (permalink) Old 02-15-2008, 09:19 PM Thread Starter
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So then I'm fine.

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post #6 of 13 (permalink) Old 02-15-2008, 09:29 PM
 
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Hey... if I wanted to plant a supe nano - like a gallon - could I just blow bubbles through a straw couple times a day for my DIY Co2?

:-P Just wondering.....
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post #7 of 13 (permalink) Old 02-15-2008, 09:43 PM Thread Starter
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If this is a serious question, then no. The ammount of CO2 you exhale is very low... I think the air you exhale is something like 78% nitrogen, 16% oxygen, 4% CO2 and 2% other stuff.

Go for it though

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post #8 of 13 (permalink) Old 02-16-2008, 12:17 AM
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Pretty sure pranks is kidding

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post #9 of 13 (permalink) Old 02-16-2008, 12:32 AM
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Thanks: Actually, not that pretty low. The percent you are talking about is what we found in normal air.
We inhale O2 to do cell respiration, producing ATP to supply every tasks in our body. CO2 is the product of cell respiration when oxidizing electron from our food. I am not sure how much CO2 you normally exhale, but should be equal to percent of O2 we inhale.


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post #10 of 13 (permalink) Old 02-16-2008, 02:37 AM
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Just in case you weren't kidding about blowing into a tank for CO2, check out this article on thekrib.com: CO2 By Human Respiration. It's an old article from 1998, though.
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post #11 of 13 (permalink) Old 02-16-2008, 03:59 AM Thread Starter
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Quote:
Originally Posted by stagius View Post
Thanks: Actually, not that pretty low. The percent you are talking about is what we found in normal air.
We inhale O2 to do cell respiration, producing ATP to supply every tasks in our body. CO2 is the product of cell respiration when oxidizing electron from our food. I am not sure how much CO2 you normally exhale, but should be equal to percent of O2 we inhale.
http://mistupid.com/chemistry/aircomp.htm
"The air that leaves a person's lungs during exhalation contains 14% oxygen and 4.4% carbon dioxide."

This isn't a reliable source, but I was lazy... I'm sure these numbers are accurate. I know that you use very little of the Oxygen you breathe in per breath, so you can breathe into a plastic bag and re-breathe the air you exhale for a few breaths.

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post #12 of 13 (permalink) Old 02-16-2008, 04:23 AM
 
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Quote:
Originally Posted by fishscale View Post
Pretty sure pranks is kidding
Yep - :-)

LOL!
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post #13 of 13 (permalink) Old 02-16-2008, 04:37 AM
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Actually there was a guy not too long ago on here who was trying to convince us that no one could prove it didn't work. It didn't take to long.

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