rising KH - The Planted Tank Forum
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post #1 of 17 (permalink) Old 03-12-2007, 12:32 AM Thread Starter
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rising KH

I have a new planted tank with co2 injection. My KH has been rising. A little over a week ago it was 5 degrees. We got back from vacation yesterday and found some algae in the tank... so today I cleaned the algae off, and did a 50% water change. The tap waters KH is 2 degrees. I retested today and it's 8 degrees in the tank several hours after the water change. My ph 6.6. Which according to the co2 charts is 60ppm. I'm wondering what could be causing the KH to rise, and if it's a problem? I put 10 shrimp in the tank yesterday, if that matters. Will start fertilizing tomorrow.
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post #2 of 17 (permalink) Old 03-12-2007, 02:25 AM
 
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Maybe your substrate.
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post #3 of 17 (permalink) Old 03-12-2007, 03:49 AM Thread Starter
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My substrate is eco complete. But I do have five or six rocks in there that my husband got from Death Valley and a piece of driftwood that we found in a local stream.
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post #4 of 17 (permalink) Old 03-12-2007, 04:16 AM
 
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Some Eco Complete will raise your KH. I had two bags that did this in December and called to get them replaced. The replacement bags were fine.
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post #5 of 17 (permalink) Old 03-12-2007, 04:19 AM Thread Starter
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How did you know it was your Eco Complete? And how would I know if it was mine?
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post #6 of 17 (permalink) Old 03-12-2007, 04:20 AM
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Put some of it in a bowl, along with fresh water and see if the kH increases.
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post #7 of 17 (permalink) Old 03-12-2007, 04:20 AM Thread Starter
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From what we understand... co2 does not lower or raise KH does it? It only affects the PH right?
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post #8 of 17 (permalink) Old 03-12-2007, 05:19 AM
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How long has the tank been set up?

And did you test the rocks?
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post #9 of 17 (permalink) Old 03-12-2007, 03:30 PM
 
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Eco can do it so can the rocks.
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post #10 of 17 (permalink) Old 03-12-2007, 04:04 PM Thread Starter
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The tank has been set up for a little over two weeks.

How do you test rocks?
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post #11 of 17 (permalink) Old 03-12-2007, 04:25 PM
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Ok. It could be the Eco-Complete.

To test the rocks you will need to remove them from the aquarium. Let them dry completely.

Then chip off a small piece and use muriatic acid to test it. If the rock fizzles, sizzles, spits, smokes or explodes it will effect the water chemistry.

Please note that the chance of a piece of the rock exploding are extremely small.
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post #12 of 17 (permalink) Old 03-12-2007, 04:55 PM
 
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Quote:
Originally Posted by phishy View Post
How did you know it was your Eco Complete? And how would I know if it was mine?
My tank was empty except for the Eco. I only used RO+DI water and my KH would rise back to where it was after about 3 days. There were lots of white and gray rocks in the batch, the replacement bags did not have this issue or the white rocks.
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post #13 of 17 (permalink) Old 03-12-2007, 06:08 PM
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where do you get muriatic acid?
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post #14 of 17 (permalink) Old 03-12-2007, 06:13 PM
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Hardware store or a pool supplies shop. It's used in pools.
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post #15 of 17 (permalink) Old 03-12-2007, 06:17 PM
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Also used to clean concrete.
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