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Old 07-25-2020, 06:44 AM   #1 (permalink)
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I picked up a drop checker for my tank to see what the CO2 levels were. As expected there low. So to start I'm using seachem excel to dose the tank with liquid carbon.

Will using liquid carbon register on a drop checker?

Also how often or if at all do you need to replace the test fluid in the drop checker?
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Old 07-25-2020, 07:10 AM   #2 (permalink)
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Old 07-25-2020, 08:07 AM   #3 (permalink)
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Default Re: CO2 dropper checker questions

If you really want to know how much CO2 is in the tank water you have to use a drop checker with distilled water in it, with just enough baking soda in it to get a KH of 1 to 4 dKH. Put 2 or 3 drops of PH measuring reagent. Then you can use this chart to get a crude measurement of the CO2: [IMG][/IMG]
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Old 07-25-2020, 08:14 AM   #4 (permalink)
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Default Re: CO2 dropper checker questions

If you're not adding any CO2, your CO2 level in your tank should be around 1-2ppm.
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Old 07-25-2020, 07:58 PM   #5 (permalink)
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Default Re: CO2 dropper checker questions

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Originally Posted by mistergreen View Post
If you're not adding any CO2, your CO2 level in your tank should be around 1-2ppm.
As I recall, Ms Walstad measured CO2 in an El Natural tank and found that it had something in the range of about 20 ppm before the lights came on. Once the lights were on, and the plants were growing, the CO2 level dropped way down. That is the reasoning behind her recommendation that we use a rest period in the middle of the day - it allows the CO2 level to rise again to a useful level. Also, years ago it was shown that atmospheric CO2 raises the tank CO2 to about 3 ppm. Someone more skilled than me calculated the theoretical ppm of CO2 from the atmosphere and arrived at the 3 ppm number, too. Since then we have had numerous debates about this, so I'm not at all sure what the "right" answer is.
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Old 07-25-2020, 08:12 PM   #6 (permalink)
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Default Re: CO2 dropper checker questions

Yes assuming the OP’s tank is plain substrate.
NPT’s co2 will vary a lot and will run out when the carbon is gone, I think around 6 months. Yeah, indoor co2 levels are higher than outdoor so 3ppm, naturally is possible.
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Old 07-26-2020, 02:18 AM   #7 (permalink)
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Default Re: CO2 dropper checker questions

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Originally Posted by Last5liter View Post
I picked up a drop checker for my tank to see what the CO2 levels were. As expected there low. So to start I'm using seachem excel to dose the tank with liquid carbon.

Will using liquid carbon register on a drop checker?

Also how often or if at all do you need to replace the test fluid in the drop checker?
You need to replace the test fluid in the drop checker 4 to 6 weeks.
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