Zebra Rock raising ph and GH? - The Planted Tank Forum
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post #1 of 16 (permalink) Old 09-29-2009, 11:27 PM Thread Starter
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Zebra Rock raising ph and GH?

I've notice that the water in my 20 gallon shrimp tank is harder than my tap water. Upstate NY's tap has 12 degrees hardness, and my aquarium water is steady at 14-15 with weekly 25% water changes.

Does anyone know whether or not Zebra Rock raises pH and GH? I don't have any HCL, and I don't trust my white vinegar test (which did not bubble.)

Has anyone tried this? I'm assuming the rocks do raise pH, but what about GH?

edit: My aquarium pH is actually ~6.8, compared to 7.6 out of the tap. This confuses me even more. Could something in my aquarium be raising GH but lowering pH? All I have is a couple smaller Zebra Rocks and 4 pieces of driftwood that have been soaking for months now.

Last edited by Primetime Rob; 09-30-2009 at 12:44 AM. Reason: pH information
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post #2 of 16 (permalink) Old 09-30-2009, 12:24 PM
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when you say zebra rock which are you refering to there is a basalt with calcite bands, a lime stone with calcite bands and there are basalts with QTZ bands all of which i have seen called zebra rock.

as for the PH the drift wood will release tannins which in a ffect reduces your PH. is your water tea colored or do you run carbon to remove it.

GEOLOGY Rocks Have A Gneiss Day
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post #3 of 16 (permalink) Old 10-01-2009, 01:05 AM Thread Starter
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Not sure which rock it is. All i know is that it won't bubble when I add white vinegar. I need to buy some muriatic acid.

The driftwood must be lowering my pH, but the water is very clear. I'm more concerned about softening the water.
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post #4 of 16 (permalink) Old 10-01-2009, 01:15 AM
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ince you get the acid it will be easyer to determine which rock you have also a picture would help

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post #5 of 16 (permalink) Old 10-01-2009, 04:52 AM Thread Starter
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ince you get the acid it will be easyer to determine which rock you have also a picture would help
Check out the link in my sig. I have four pieces of driftwood now, but the two rocks are the same.
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post #6 of 16 (permalink) Old 10-01-2009, 11:30 PM
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well i compared your photos to what i have in my tanks you look to have a basalt with QTZ but you need to get acid to definitively answer the question

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post #7 of 16 (permalink) Old 10-03-2009, 11:18 PM
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I just started a shrimp tank and am using zebra rock. LFS said it was safe and I also did acid test with Seachems acid buffer>>> No fizz. BUT something is sending pH up.
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post #8 of 16 (permalink) Old 10-04-2009, 12:53 AM
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I just started a shrimp tank and am using zebra rock. LFS said it was safe and I also did acid test with Seachems acid buffer>>> No fizz. BUT something is sending pH up.
what is your substrate.

GEOLOGY Rocks Have A Gneiss Day
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post #9 of 16 (permalink) Old 10-04-2009, 01:04 AM
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Flourite Black Sand.
I poured a pile of Acid Buffer on the rocks and wet them...........no fizzing.

Last edited by newt; 04-10-2010 at 07:36 PM.
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post #10 of 16 (permalink) Old 10-05-2009, 04:23 PM
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since you have all ready tested all your rocks and have drift wood only 2 test left.

one test the florite i have heard of people getting bad florite.

second set out a bucket of your water source and monitor it for PH change

after that im out of ideas and recomend looking for a hydrologist on here.

GEOLOGY Rocks Have A Gneiss Day
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post #11 of 16 (permalink) Old 10-06-2009, 04:22 PM
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I've only had an issue with pH rise but not GH.
I took the (temporary) fish out today.
I was using an established filter on a new tank setup but maybe there is a cycling issue going on.
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post #12 of 16 (permalink) Old 10-06-2009, 04:49 PM
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what is that large piece of moss atttached to and were did your Ph Stabalize.

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post #13 of 16 (permalink) Old 10-06-2009, 05:58 PM
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I have a clump of Riccia on a granite river rock. I have many of these in my 75. The pH has not been rising as rapidly or as much for about 2 days now.
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post #14 of 16 (permalink) Old 10-08-2009, 04:01 PM
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I have a clump of Riccia on a granite river rock. I have many of these in my 75. The pH has not been rising as rapidly or as much for about 2 days now.

well not to state the obvious but what ever you added either has reached equilibrium until the next water change. or what over you removed has allowed the water to return to normal. sorry i want of much help but that how it is some times

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post #15 of 16 (permalink) Old 10-08-2009, 04:50 PM
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Actually I want to thank you very much for your help.
The pH has been pretty much around 7.0

I add calcium and magnesium sulfate as my tap water is very soft.
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