CO2 PH Controller
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Old 11-17-2003, 06:15 AM   #1
barako927
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I'm new to this hobby as far as planted tank, I use to have a Tang cichlid tank. I have a 135G tank and I was wondering if the PH in my tank is stabilize to a PH of 6.5. With the PH controller basically it will not turn on the co2 until the change in PH. Is that okay if the co2 does not turn on for a long period of time?

Thanks..
Jose
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Old 11-17-2003, 01:21 PM   #2
Rex Grigg
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What pH is your water source? What is the kH of th water source? What is the kH of your tank? If you have a constant pH of 6.5 in your tank then you must have very low hardness. Either that or your pH monitor needs to be calibrated. Try doing a regular pH test on the tank. I'm betting you have a hardware failure somewhere either that or you are adding some kind of pH buffer to lower the pH.
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Old 11-17-2003, 04:02 PM   #3
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Rex.. I don't use any buffer on the tank.. The water source ph is usually around 7.8. I haven't really tested for KH yet but will do when I get home. I will try to calibrate ph controller again tonight as well.
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Old 11-18-2003, 02:18 AM   #4
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Ok, so no buffer. You really should not be playing with CO2 unless you know your kH. The reason being is if you have high kH and have a 1.3 point drop in your pH you can have lethal levels of CO2 in your water.
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Old 11-18-2003, 03:02 AM   #5
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The KH reading is 0.6 and re-calibrated my controller and it's set okay..
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Old 11-19-2003, 12:07 AM   #6
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With a kH of .6 and a 1.3 point drop in your pH you are ok. In fact looking at the pH/kH/CO2 chart with a pH of 6.5 and a kH of .6 you really don't have a lot of CO2 in the water. Do you by chance have a water softener?
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Old 11-19-2003, 04:35 AM   #7
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Rex.. I made a mistake with the KH measurement.. I used a saltwater tester because I have a reef tank as well. I bought the tester and will test it using FW tester instead.
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