Preferred parameter to tweak - KH or PH? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 06-06-2005, 02:28 AM Thread Starter
EoS
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Preferred parameter to tweak - KH or PH?

Trying to hit that sweet spot of 30ppm of CO2. We run a ph controller set at 6.9, and our KH is 6. We need to either lower the PH or raise KH to hit the numbers right.

Last time we tested out of the tap (after 24hours) the PH is 8-ish, KH is 3.5, (GH is around 14), and LOADED with chlorimine . That was several months ago though.

Any thoughts on which is the better parameter to tweak?

TIA,
Sean

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post #2 of 8 (permalink) Old 06-06-2005, 03:15 AM
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Lower the pH. That way you are adding nothing to the water.

But my question is if your tap water is around 8 and your tank is around 6 where is the extra kH going? If your tap water varies then you will have to check your set point with every water change.
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post #3 of 8 (permalink) Old 06-06-2005, 03:15 AM
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I would tweak your pH. When you start tweaking KH, the CO2 chart goes out the window. All you have to get your pH to is 6.7.

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post #4 of 8 (permalink) Old 06-06-2005, 03:34 AM
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Quote:
Originally Posted by Rex Grigg
Lower the pH. That way you are adding nothing to the water.

But my question is if your tap water is around 8 and your tank is around 6 where is the extra kH going? If your tap water varies then you will have to check your set point with every water change.
If their tap water is anything like mine, then there was no KH in the first place. Just an odd high pH. My tap water is 8.2 coming out of the faucet. Then it starts to drop quickly over the next day. KH tests reveal a KH of 1-2d. Great for lovely pH crashes

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post #5 of 8 (permalink) Old 06-06-2005, 03:38 AM Thread Starter
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Thanks for the replies. Makes sense about not adding anything to the water (though I understood Baking Soda to be the accepted way of raising KH without affecting other parameters).

Rex, I think you misread my numbers though - PH is 8 out of the tap, KH is 3.5. We use baking soda to raise the KH.

We figured altering KH would be less detrimental to the fish than major PH swings with water changes.

As for fluctuations, I don't think it is - we just haven't tested the tap in a while. We've got some sitting to test tomorrow.

Sean

72g bowfront, 4.5 wpg (4x65w 48" + 1x65w 24" Aqualights), 100% Eco-complete, Eheim 2026 & 2213, Pressurized CO2 w/JBJ Regulator & Milwaukee SMS122 pH controller, TurboTwist 12x UV Sterilizer

30g, 4.6 wpg, 100% Eco-complete, Eheim 2026, Pressurized CO2 w/Milwaukee regulator and SMS122 PH controller, Turbotwist 6x UV Sterilizer

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post #6 of 8 (permalink) Old 06-06-2005, 02:24 PM
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pH changes due to CO2 won't harm the fish.

Tom Barr has shown this to be true and I also have experience with it.

I have tap water that has NO kH. And it comes from the tap with a pH of around 6-6.5 most of the time. I have to add kH and gH. But I do it the lazy way by using sugar sand in my canister filters.

Also when giving tap water readings it's best to give the readings based on water that has rested for 24 hours. If I let my tap water rest for 24 hours then the pH comes up to 6.9-7.2 most of the time.
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post #7 of 8 (permalink) Old 06-06-2005, 04:51 PM
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On my first pass through Rex's post I was also confused. I think the idea is that you can stop buffering the KH (adding baking soda) and instead lower the set point of the controller.

Does this seem right?

Quote:
Originally Posted by EoS
Rex, I think you misread my numbers though - PH is 8 out of the tap, KH is 3.5. We use baking soda to raise the KH.

Moved to Tucson.
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post #8 of 8 (permalink) Old 06-07-2005, 03:35 PM
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adding Baking soda will raise both Kh and pH.
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