CO2 Injection is raising my KH.. but lowering PH. What the hell? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 08-24-2009, 05:39 AM Thread Starter
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CO2 Injection is raising my KH.. but lowering PH. What the hell?

I'm completely confused.

I just started adding Co2 and am trying to guage how much co2 is in my tank. When i tested my water params two days ago I had a KH of 2.5 and PH of about 6.8. Yesterday KH was about 3.25 PH 6.5-6.6. Today KH apparently is 4 and PH is 6.4-6.6.

I've been slowly increasing the amount of CO2 in my tank to find the correct BPS.

Any help? I have planted tank with some rocks and Aquasoil in my tank.
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post #2 of 4 (permalink) Old 08-24-2009, 06:01 AM Thread Starter
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Well, I think i've figured it out. It looks like my rocks were carbonaceous. I tested a little bit of one of the rocks in some hydrochloric acid and it bubble away like crazy.

Another lesson for me to make sure you test rocks before adding them to an aquascape.
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post #3 of 4 (permalink) Old 08-24-2009, 12:24 PM
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You found it

I have some cool lime stone rock with holes from water flow drilled through it that looked really cool in the tank. Low tech (no CO2) they're OK but driving pH acidic with CO2 caused me a problem with them. Weekly large volume WC with EI dosing kept things close but skipping a week was an OUCH!


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post #4 of 4 (permalink) Old 08-26-2009, 10:12 PM
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Quote:
Originally Posted by Mourt View Post
Well, I think i've figured it out. It looks like my rocks were carbonaceous. I tested a little bit of one of the rocks in some hydrochloric acid and it bubble away like crazy.

Another lesson for me to make sure you test rocks before adding them to an aquascape.
I think you mean calcareous. Carbonaceous would mean your rocks have carboniferous material (like coal). Sorry, the geologist coming out in me.

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