pH and KH rising, rock suspected - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 05-19-2013, 03:37 PM Thread Starter
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pH and KH rising, rock suspected

Never had this happen before. My well water is 6.5 pH, 0 KH, <3GH. Been noticing a steady climb in pH and KH. Two days ago, pH was 7.2 and KH was 2. Substrate is black sand, being used for 15+ years, never affected water before, minimal dosing of flourish for the plants. All rocks passed the the acid test, no bubbling. I use Seachem equilibrium to bring up the GH to 5. Some Malaysian driftwood and a handful of oak leaves from my backyard. 20% water change about 3x a month. Inhabitants are blue pearl shrimp and snails.

Like I said, I never had the happen before, pH drop, yes, rise, no. Anyone have experience with a rock "cheating" on the acid test? The only other theory I have is the snail and shrimp shells leaching calcium, but this seems a bit of a reach.
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post #2 of 5 (permalink) Old 05-20-2013, 03:07 PM
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What kind of acid did you use for the test? If it was vinegar or a chemical from an API test kit, it likely wasn't strong enough to really test for carbonates.

Having your KH rise a bit for the shrimp you're keeping could be a good thing, honestly.

I've had all kinds of rocks impact my water parameters. Usually happens the older they get and the more they start to break down.
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post #3 of 5 (permalink) Old 05-20-2013, 04:46 PM Thread Starter
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Quote:
Originally Posted by somewhatshocked View Post
What kind of acid did you use for the test? If it was vinegar or a chemical from an API test kit, it likely wasn't strong enough to really test for carbonates.

Having your KH rise a bit for the shrimp you're keeping could be a good thing, honestly.

I've had all kinds of rocks impact my water parameters. Usually happens the older they get and the more they start to break down.

It was vinegar.

So some KH is ok? All the guidelines I see indicate 2 or less.

All my other tanks have been either amazonian or rift lake so I never encountered this issue before. Thanks for your input.
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post #4 of 5 (permalink) Old 05-20-2013, 04:53 PM
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Blue Pearls are Neo. That means you don't really have to worry about KH.

They're going to do better with carbonates in the water, which your rocks are apparently providing.
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post #5 of 5 (permalink) Old 05-21-2013, 12:09 AM Thread Starter
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Thanks for the help!
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