C02 24/7? - The Planted Tank Forum
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post #1 of 27 (permalink) Old 10-08-2016, 04:28 AM Thread Starter
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C02 24/7?

In the past I have run my C02 for 2 hours before the lights come on and shut off with they go out. Is there a down side to just having the C02 (slower release rate) on 24/7?
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post #2 of 27 (permalink) Old 10-08-2016, 04:36 AM
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Large pH swings. 2 hours might not be a lot, but over say 8 hours of no light you might be looking at a pretty low pH

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post #3 of 27 (permalink) Old 10-08-2016, 04:43 AM
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I dont know why you would want to dose the CO2 when the lights are off, since the plants dont use it during cellular respiration which occurs at night. At least I think that is how it works


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post #4 of 27 (permalink) Old 10-08-2016, 06:44 AM
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I dont know why you would want to dose the CO2 when the lights are off, since the plants dont use it during cellular respiration which occurs at night. At least I think that is how it works
To be more correct, cellular respiration occurs at all times of the day.

Photosynthesis only occurs in the presence of light. CO2 is only used during photosynthesis

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post #5 of 27 (permalink) Old 10-09-2016, 06:13 AM
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To be more correct, cellular respiration occurs at all times of the day.

Photosynthesis only occurs in the presence of light. CO2 is only used during photosynthesis
Thanks for that correction !


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post #6 of 27 (permalink) Old 10-09-2016, 04:28 PM
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The most obvious reason for running CO2 24 hours a day is to be able to set the bubble rate and forget it. Another reason is to not have to be concerned about how long it takes to build up the concentration of CO2 in the tank every day. You can run CO2 continuously if the amount you are adding to the water is low enough that the reduced usage of CO2 by the plants at night doesn't raise the amount in the water above what the fish can live with. I'm sure if you use only 10 ppm of CO2 you can run it continuously. And, if you use 40 ppm you can't run it continuously. And, yes, of course it wastes CO2 to run it at night.

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post #7 of 27 (permalink) Old 10-09-2016, 05:39 PM
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I dont know why you would want to dose the CO2 when the lights are off
More stable PH.
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post #8 of 27 (permalink) Old 10-10-2016, 03:18 AM Thread Starter
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I agree it would waste some C02, but over all my will be more stable. Instead of blasting a high bbl count during lights-on, and zero while they are offs.
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post #9 of 27 (permalink) Old 10-10-2016, 03:24 AM
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there's nothing wrong with it. Shoot for something like 1 bubble / 30 seconds, depending on how large your aquarium is.
You'd want it to build up over night to something like 25-30ppm before the lights turn on. No need to go higher than this.

I wonder if it's a waste.

CO2 24/7
1/30 sec = .033*60*60*24 = 2880 bubble

CO2 8 hours
3/sec = 3*60*60*8 = 86400 bubbles

just musing


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Last edited by mistergreen; 10-10-2016 at 03:42 AM. Reason: +
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post #10 of 27 (permalink) Old 10-11-2016, 04:35 AM
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there's nothing wrong with it. Shoot for something like 1 bubble / 30 seconds, depending on how large your aquarium is.
You'd want it to build up over night to something like 25-30ppm before the lights turn on. No need to go higher than this.

I wonder if it's a waste.

CO2 24/7
1/30 sec = .033*60*60*24 = 2880 bubble

CO2 8 hours
3/sec = 3*60*60*8 = 86400 bubbles

just musing
I know you have done a lot of tinkering with CO2 measuring over the past 2 years or so. Did you ever figure out how fast the CO2 dissolved in an aquarium will last before it drops down well below 10 ppm? Of course it depends on how much you have to start with, so assume you start at 20-30 ppm.

I'm asking because what you posted above hints that the depletion will not be so fast that you need to keep adding it at a high rate throughout the photoperiod.

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post #11 of 27 (permalink) Old 10-11-2016, 01:09 PM
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I know you have done a lot of tinkering with CO2 measuring over the past 2 years or so. Did you ever figure out how fast the CO2 dissolved in an aquarium will last before it drops down well below 10 ppm? Of course it depends on how much you have to start with, so assume you start at 20-30 ppm.

I'm asking because what you posted above hints that the depletion will not be so fast that you need to keep adding it at a high rate throughout the photoperiod.
The rate in with CO2 leaves the aquarium depends on the surface area which also includes the surface turbulence. It also depends of the temperature. It leaves really quick in a 75G tank (30 mins) and slower in a 10G with a cover (hours). So there are lots of variables so leaving CO2 on 24/7 might not be a waste. It could save CO2.

I see that heavily planted tanks would consume about 10ppm in a slow passive system within the photoperiod. I don't think I can tell in high rate CO2 injection.


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post #12 of 27 (permalink) Old 10-11-2016, 03:41 PM
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I leave my co2 at 1 bps in my 20L and have for well over a year. I keep a few oxygen-demanding species, including hillstream loaches, and they seem to do fine with the overnight co2. Make sure there's plenty of surface agitation for gas exchange and it should be fine.
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post #13 of 27 (permalink) Old 10-11-2016, 03:52 PM
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Originally Posted by Kensho View Post
In the past I have run my C02 for 2 hours before the lights come on and shut off with they go out. Is there a down side to just having the C02 (slower release rate) on 24/7?
i run 1 bbps on my 10 gal 24/7. mainly because I dont have a way to turn it on and off everyday so i leave it on. everything is fine. but theoretically better to turn off at night.
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post #14 of 27 (permalink) Old 10-11-2016, 07:18 PM
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Originally Posted by mrfiock View Post
I leave my co2 at 1 bps in my 20L and have for well over a year. I keep a few oxygen-demanding species, including hillstream loaches, and they seem to do fine with the overnight co2. Make sure there's plenty of surface agitation for gas exchange and it should be fine.
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Originally Posted by IntotheWRX View Post
i run 1 bbps on my 10 gal 24/7. mainly because I dont have a way to turn it on and off everyday so i leave it on. everything is fine. but theoretically better to turn off at night.
Do you guys know how much CO2 (ppm) is in your tank before the lights turn on?


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post #15 of 27 (permalink) Old 10-11-2016, 07:35 PM
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When you have a medium to largish tank, add a sump, add powerheads, add heat from those pumps and lights, you really run through co2 way faster than you thought you would. Keeping the pH stable 24/7 with a controller isn't really worth it versus keeping it stable with a controller during the photoperiod only. I have noticed no difference, other than racing through co2 when I do not try to conserve it.
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