ph, kh, & gh - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 04-15-2005, 05:40 PM Thread Starter
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ph, kh, & gh

I need to know how to raise my KH, and GH while lowering my PH. Any suggestions?

Ph 7.2
kh 1 or less
gh 3

Target levels

Ph 6.8
KH 4 or 5
Gh not real sure

Any help would be great! This is a 125gal tank that is moderatly planted. With a light fish load. 220 watts of N.O. light and no co2. I dose flurish, flurish excell, and just started doseing kno3 using greenlight stump remover.
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post #2 of 7 (permalink) Old 04-15-2005, 05:54 PM
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May I ask why you feel the need to change your water parameters? If you're not injecting CO2 there's no real reason to raise your KH.

Are you having difficulties growing plants? What kind of plants are you trying to grow?

óBill

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post #3 of 7 (permalink) Old 04-15-2005, 06:15 PM Thread Starter
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If I go by the Ph, Kh, charts to get my Co2 then at my current number I do not have enough co2. I would like to get my Ph down to at least 6.8 because I have rams that like the soft acidic water. So if I can get the Ph to 6.8 and the Kh between 3 and 5 then I think that would make the fish and plants happy. My tap water has a ph of about 7.2 to 7.6 and less then 1 dkh but if I use baking soda to buffer the kh then it raises my Ph, and I need it to go the other way.
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post #4 of 7 (permalink) Old 04-15-2005, 06:29 PM
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Quote:
Originally Posted by spinnerbayt
If I go by the Ph, Kh, charts to get my Co2 then at my current number I do not have enough co2. I would like to get my Ph down to at least 6.8 because I have rams that like the soft acidic water. So if I can get the Ph to 6.8 and the Kh between 3 and 5 then I think that would make the fish and plants happy. My tap water has a ph of about 7.2 to 7.6 and less then 1 dkh but if I use baking soda to buffer the kh then it raises my Ph, and I need it to go the other way.
The only way to increase CO2 is to add CO2. So after you get a KH between 3-5, yep as you observed your pH also rises. CO2 is the only way to lower it and be beneficial for the plants.

A GH of 3 should be fine. If you are having calcium or magnesium deficiencies then it should be considered.
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post #5 of 7 (permalink) Old 04-15-2005, 06:40 PM
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spinner:

The charts are read with a given KH/pH, with injection of CO2 (acidic) the pH will drop and you can use the chart to estimate your CO2. If you are not adding CO2 you are likely at 3-5 ppm. If you do use CO2 I would bring the KH up to ~3 so that the pH does not crash when the ability to buffer runs out.

With rams. hardness (low) is more importaint than pH when it comes to hatching eggs.

Moved to Tucson.
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post #6 of 7 (permalink) Old 04-15-2005, 09:13 PM
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Is the formula for dgH the same as dkH?

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post #7 of 7 (permalink) Old 04-15-2005, 09:21 PM
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Is your question does pH depend on GH? No. GH measures calcium and magnesium that do not participate in acid/base chemistry like carbonate which certainly does.

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