Co2 on 24/7 ?? How to? - The Planted Tank Forum
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post #1 of 6 (permalink) Old 07-26-2020, 07:59 AM Thread Starter
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Co2 on 24/7 ?? How to?

Many times solenoids have failed and killed everything, maybe im not lucky. Im getting into planted tanks again after a gap of 3-4yrs, and planning to run co2 24/7. My tank is 24x24x18"H. Here is my plan:

1) 1-bps 24/7
2) lights on for 6hrs full intensity (5-11pm), as my tank is close to window which gets indirect sunlight most of the day
3) from 11pm 7am i keep an airstone on.
4) will be using a co2 checker

Not worried about co2 waste, as it better than malfunction of solenoid.

Would this be ok??

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post #2 of 6 (permalink) Old 07-26-2020, 03:34 PM
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I've run CO2 24/7 - I'm doing that on my current tank.

I haven't always found an airstone is necessary and sometimes it drives pH up at night. It all depends on how the surface gas exchange is and how much CO2 your plants use in the photoperiod. I usually start by setting the CO2 to be 30 PPM in the morning and see where it is by the end of the day. I often find it doesn't fall too far and an airstone is unnecessary.

There's an argument to be made that a daytime pH rise is more natural for plants and fish because that's what happens in natural waters. CO2 falls during the day and accumulates again at night. It also makes your setup safer if there is an overnight power outage.
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post #3 of 6 (permalink) Old 07-26-2020, 05:42 PM
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I run 24/7 without problems and pH barely budges day or night (dKH ~3). I run the same level of surface agitation 24/7, i.e.; nothing special at night, such as airstones (airstones are not the best way to ensure good gas exchange).

Rather than focusing on bps, focus on moving CO2 to a point based upon fish comfort, but very gradually. One of the better ways of targeting is to compare pH of degassed tank water (a sample that has been sitting out a few days) to fully gassed tank water. A difference of 1 point generally indicates 30ppm of CO2, which a common target. DC's are ok, but can be misleading and do need to be recharged every couple of weeks.
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post #4 of 6 (permalink) Old 07-26-2020, 08:28 PM Thread Starter
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I run 24/7 without problems and pH barely budges day or night (dKH ~3). I run the same level of surface agitation 24/7, i.e.; nothing special at night, such as airstones (airstones are not the best way to ensure good gas exchange).

Rather than focusing on bps, focus on moving CO2 to a point based upon fish comfort, but very gradually. One of the better ways of targeting is to compare pH of degassed tank water (a sample that has been sitting out a few days) to fully gassed tank water. A difference of 1 point generally indicates 30ppm of CO2, which a common target. DC's are ok, but can be misleading and do need to be recharged every couple of weeks.
Every week recharge??

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post #5 of 6 (permalink) Old 07-26-2020, 09:18 PM
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Every week recharge??

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I've found that they start to drift after 2-3 weeks.
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post #6 of 6 (permalink) Old 07-27-2020, 12:17 PM Thread Starter
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I've found that they start to drift after 2-3 weeks.
Oh, didnt know that

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