So I just went pressurized and my KH dive bombed - The Planted Tank Forum
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post #1 of 5 (permalink) Old 01-03-2006, 08:58 AM Thread Starter
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So I just went pressurized and my KH dive bombed

I got a pressurized CO2 system for Christmas and I've been tinkering with it, fine tuning it so my otos are not gasping (strange that only one oto is gasping while the other otos and neons are not). My KH before going pressurized was about 12-13 and with pressurized is 2. My GH stayed the same and my pH says 7.4 on a high end pH test (I should pick up a low range one). Someone told me that the KH dropped because of the carbonate...which I don't really get...
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post #2 of 5 (permalink) Old 01-03-2006, 12:27 PM
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The CO2 should not have had any effect on your kh. Something else is screwy there. Make sure your kits are all ok, and your testing is accurate.

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post #3 of 5 (permalink) Old 01-03-2006, 04:21 PM
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Co2 can eat Kh, but it takes MONTHS of no water changes. A week of even high CO2 dosing would not eat 10dKh.

Either your kit is bad, you messed up the test, or something else is altering your water chemistry.

Using tap water? What does the tap water test at?
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post #4 of 5 (permalink) Old 01-03-2006, 11:04 PM
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Are you sure about the KH reading? 12-13°dKH seems REALLY high to me and I live in an area with 'liquid rock' for water. I've heard that KH tests expire quickly, perhaps a new test kit would help?
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post #5 of 5 (permalink) Old 01-05-2006, 03:51 AM
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Definately get an Aquarium Pharmaceuticals KH test kit. They are cheap at big Als online. THe CO2 concentration is based upon the ratio of KH (your water's temporary hardness or carbonate hardness) and your water's pH. Something is out of wack in those numbers, it would seem. Yes, KH can be depleted by CO2, but that is something that folks with soft water tend to have to deal with. You can figure out your CO2 concentration (ppm) by looking at one of the CO2 charts. For example, a KH of 4.5 and pH of 6.6 yields a dissolved ppm CO2 of 33.9 which is a nice target level. One can get there with different pH and KH levels, but 7.4 pH will contain very little dissolved CO2. Here is a link to a valuble resource:

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