Calibrate your drop checker, CO2 is bad for fish! - Page 2 - Equipment - Aquatic Plant Central

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Old 11-06-2008, 05:36 PM   #11 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

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Originally Posted by Squawkbert View Post
I suspect it would be prudent for you to double check the calibration of your pH meter and the dKH of your drop checker's solution before you go off dismissing the work of numerous others on the subject.

pH controllers are only as good as their probes. If probes are neglected, CO2 delivery accuracy will suffer. If your probe gets gunked up at a pH above your set point, your CO2 tank will remain "on" until the pH drops to a certain point - which may be never, as far as your probe is concerned. You should also regularly calibrate the probe using standard buffers bracketing the range of pH values you anticipate the probe seeing. In addition to accuracy, you need to pay attention to the response time of the probe.

pH controllers are not "set it and forget it" devices.

Good advice but I don't think you have actually used a pH controller.

I calibrate my controller about every other week. I have a pocket pH meter that I use to verify my controller every few days. I also have a drop checker that I use to verify that my controller is working.

I can measure the CO2 level in my tank to +/- 2ppm.
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Old 11-06-2008, 05:53 PM   #12 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

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Originally Posted by ray-the-pilot View Post
None of the above.

Here is how you do it:

https://www.aquaticplantcentral.com/f...002#post427002
The link just gives you the previous page (?)
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Old 11-06-2008, 06:07 PM   #13 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

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The link just gives you the previous page (?)
Maybe I was being obtuse, sorry. At the bottom of that post I explain how to find out when your fish are being affected by CO2.
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Old 11-06-2008, 06:35 PM   #14 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

Is this a reliable way to quantify the amount of CO2 in your tank? Measuring the pH change of a small amount of tank water that has sat out in a paper cup for 24 hours compared to that inside the tank. A difference of 1 degree is supposed to equal 30 ppm.
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Old 11-06-2008, 06:58 PM   #15 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

This is a really good idea but there is a problem. In every tank there are different chemicals that affect the pH of the water. Each tank is unique; so, when you take CO2 out of the water (letting it sit) you cannot know what effect these chemicals have on the change in pH.

The way to overcome this is to add a known quantity of CO2 into your tank and find out how much the pH changes. I explained how to do this here:

https://www.aquaticplantcentral.com/f...p-checker.html
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Old 11-06-2008, 07:45 PM   #16 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

Thanks! I'll try that. I have a pH meter already.
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Old 11-06-2008, 08:03 PM   #17 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

I agree that normal behavior stops before they are gasping at the surface for air and this dose stress the fish, If that is what you are saying. Fish behavior should be a concern when adding co2 not just plant growth and algae control. But I know many who have had fish breed and thrive in water with 30 ppm co2 (ph meter proven). The drop checker is a lose science and men are more prone to color blindness than women. This is why I think of the drop checker as a base line needing fine tuning. Fish behavior being a key factor among others. I also know those who have tested water in nature and found 30ppm co2.
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Old 11-07-2008, 03:42 PM   #18 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

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I agree that normal behavior stops before they are gasping at the surface for air and this dose stress the fish, If that is what you are saying. Fish behavior should be a concern when adding co2 not just plant growth and algae control. But I know many who have had fish breed and thrive in water with 30 ppm co2 (ph meter proven). The drop checker is a lose science and men are more prone to color blindness than women. This is why I think of the drop checker as a base line needing fine tuning. Fish behavior being a key factor among others. I also know those who have tested water in nature and found 30ppm co2.
A pH meter won't prove that there's 30 ppm CO2 in the water. You need a CO2 dissolved gas analyzer. I have a pH meter and I wish I knew how much CO2 I had in my aquarium.
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Old 11-07-2008, 04:31 PM   #19 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

From Ray-the-pilot:
Quote:
The CO2 level that corresponds to this is about 12 ppm
Maybe I'm wrong, but isn't all this based on some presumed relationship between pH and CO2....and doesn't kH figure into this equation?

How does all this relate to this....https://www.aquaticplantcentral.com/f...alculator.html

According to that, then depending on the amount of Phosphates in your tank, your equation may be unreliable?

Is it possible to get to the factual truth about this? Is there a chemist in the house?

In the words of the immortal John Lennon,
"Im sick and tired of hearing things
From uptight, short-sighted, narrow-minded hypocritics
All I want is the truth
Just gimme some truth"
http://www.youtube.com/watch?v=fBpIfVt46Bk

http://www.youtube.com/watch?v=zGmOw...eature=related

Last edited by Manwithnofish; 11-07-2008 at 04:39 PM..
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Old 11-07-2008, 04:48 PM   #20 (permalink)
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Default Re: Calibrate your drop checker, CO2 is bad for fish!

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Originally Posted by Nevermore View Post
A pH meter won't prove that there's 30 ppm CO2 in the water. You need a CO2 dissolved gas analyzer. I have a pH meter and I wish I knew how much CO2 I had in my aquarium.
Tom barr did prove this with a co2 dissolved gas analyzer ( I don't recall saying any thing about a ph meter). He has also done a lot of studying with this analyzer on many different tanks. As for a chemist I believe ray is one.
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