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post #1 of 5 (permalink) Old 03-11-2009, 03:54 PM Thread Starter
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Question PH/KH/GH question

Hi,

I'm trying achieve a stable aquarium to keep some Eriocaulon and shrimp. The target number I want to hit are PH 6.2-6.5, KH 1-2, and GH 3. I'm using RO water in my tank with no CO2 added which gives a PH reading of 6.4, KH 0, and GH 0. I'm guessing with the addition of CO2 the PH will drop even lower, but I would like to raise the KH and GH. I know mixing in some tap water can help raise both, baking soda will raise KH, and GH can be raise with GH booster from what I learned, but are there anything else that would affect them? Such as shrimp/fish waste, decaying plant matter, EI dosing with the except of the GH booster (KNO3, KH2PO4, CSM+B, Fe). Also would adding baking soda affect PH/GH and would GH booster affect PH/KH? The GH booster I have on hand consists of three part KSO4, three part CaSO4, and one part MgSO4.

Thanks in advance.

Tony
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post #2 of 5 (permalink) Old 03-11-2009, 06:00 PM
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post #3 of 5 (permalink) Old 03-11-2009, 06:14 PM
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What are your tap water parameters?

70% RO + 30% dechlorinated tap + CO2 might give you close to what you want. If not, change the ratio of RO/tap to find a good balance.
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post #4 of 5 (permalink) Old 03-11-2009, 08:10 PM
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First, you should verify that the parameters you chose are, in fact, what you need. I don't think you should be using RO/DI water, unless the tap water contains some really undesirable stuff, like excessive copper. Maybe a 50% tap, 50% RO/DI mix would be better? Then, you could add the GH booster to be sure to have enough Ca and Mg. No, it won't affect the KH or pH. It doesn't matter what the pH turns out to be - just set the CO2 at the concentration you need for the lighting you have, and whatever the pH is then is ok. It is when you try to engineer a whole set of parameters by adding things to the water that you tend to get problems you didn't expect.

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post #5 of 5 (permalink) Old 03-12-2009, 01:39 AM Thread Starter
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Quote:
Originally Posted by epicfish View Post
What are your tap water parameters?

70% RO + 30% dechlorinated tap + CO2 might give you close to what you want. If not, change the ratio of RO/tap to find a good balance.
My tap measure a PH 8.2, KH 8, GH 13, but Epicfish you was spot on. I tested 3ml of tap water with 7ml of RO water and got a reading of PH 7.4-7.6 (had a hard time differentiate the color), KH 2, and GH 4. 20% tap was close as well with a PH 7.4, KH 2, and GH 3. I think I'll start at 20% with CO2 and see where that puts me. Thanks once again folks.

Tony
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