CO2 Concern - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-08-2009, 09:21 PM Thread Starter
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CO2 Concern

The tank is 50 gallons with presurized CO2 and a PH controller.
4 x 24 watt T5 6500K 10 hours
1 x 150 watt MH 6500K 3hours
The KH reads 5 today.
It tends to fluctuate between 5-8.
PH is at 6.8-6.9, and my drop checker is at a dark green.
Based on the CO2 Chart I should be at around 24 ppm.
I am running an air pump and agitating the water surface.
But I have not seen the PH hit 7 in about two days. Thus the CO2 has not kicked on.

What gives? Should I be concerned?
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post #2 of 7 (permalink) Old 06-08-2009, 09:29 PM
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Is your pH probe calibrated?

Why does the kH fluctuate? Mine is rock solid at 10.0 or so.


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post #3 of 7 (permalink) Old 06-08-2009, 09:32 PM Thread Starter
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Yes, I calibrated it about five days ago. And tested the calibration over the weekend with my hand held ph monitor. I think my kh is dropping because I have a large amount of driftwood that still leach tannins. So after a water change its at 7-8, over the following seven days it drops to 5.

I am going to double check the ph calibration.
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post #4 of 7 (permalink) Old 06-08-2009, 09:41 PM Thread Starter
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Well there you go, the calibration was off by two tenths.
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post #5 of 7 (permalink) Old 06-08-2009, 09:55 PM
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That dropping kH might throw off some things.

So are you saying that after a water change, the kH is around 8, and the CO2 does not run? That doesn't make sense... Maybe the tannic acids keep the pH artificially low, that's why the controller doesn't kick in... not sure.


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post #6 of 7 (permalink) Old 06-08-2009, 10:16 PM
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KH only relates to the stability of the pH and not an actual set number.

What is the pH of your aged water change water?
What is the system pH after a water change?
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post #7 of 7 (permalink) Old 06-09-2009, 12:14 AM Thread Starter
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Wasserpest, The KH from my tap is 8, after a water change, my tank water is at 7. After four to five days in the tank it drops to 5 and stays at that level until my next water change.

The Ph from my tap is 7.4. Aged in the tank its 7.2. I have my controller set to 6.9.

Please note I recalibrated the probe, and its now working correctly.
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