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Discussion Starter · #1 · (Edited)
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.
 

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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.
 

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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.
 

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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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