Tap water PH lowering over time - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 07-22-2019, 01:40 PM Thread Starter
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Tap water PH lowering over time

Excess Co2 in the tap is a well known cause for PH raising over time as it gasses off, but what evaporates and causes PH to lower?

My PH comes out of the tap at 8.4, and lowers to 8.2 in 24 hours. My tanks that use tap water have a PH of 8, and don’t have any items/substrate that would lower it normally.
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post #2 of 6 (permalink) Old 07-22-2019, 08:31 PM
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Nitrification consumes alkalinity and produces nitric acid.
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post #3 of 6 (permalink) Old 07-22-2019, 11:45 PM
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Unless you have something to buffer the water, pH is almost always going down in the aquarium. Carbonic acid is produced by the reaction of CO2 and water (and our blood interestingly, known as the Bohr effect in medicine), and this is why many people time their pressurized CO2 systems around their lighting (light on is when plants utilize it). But even when using off-gassed water, most biological processes reduce pH in the aquarium. What is your goal pH in these tanks? Crushed coral, oyster grit (same thing), seashells, rocks containing lime, and all manner of things can be added to keep it from dropping as quickly if that is what you are after.

Nothing good happens fast in an ecosystem.
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post #4 of 6 (permalink) Old 07-23-2019, 03:24 AM Thread Starter
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Originally Posted by Blue Ridge Reef View Post
Unless you have something to buffer the water, pH is almost always going down in the aquarium. Carbonic acid is produced by the reaction of CO2 and water (and our blood interestingly, known as the Bohr effect in medicine), and this is why many people time their pressurized CO2 systems around their lighting (light on is when plants utilize it). But even when using off-gassed water, most biological processes reduce pH in the aquarium. What is your goal pH in these tanks? Crushed coral, oyster grit (same thing), seashells, rocks containing lime, and all manner of things can be added to keep it from dropping as quickly if that is what you are after.
Thank you, I needed a refresher course!

Most my tanks aim for a higher PH, and the majority do have shells as decor or in the filter. I have noticed a drop to 7.8 if I don’t conduct a water change in a couple months, but for the most part every one (5 tanks, from African cichlids to Sulawesi shrimp) sticks to a steady 8.0. The .4 drop in PH happens fairly quickly and consistently so I figured I’d ask.
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post #5 of 6 (permalink) Old 07-23-2019, 04:13 AM
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Quote:
Originally Posted by DesmondTheMoonBear View Post
Thank you, I needed a refresher course!

Most my tanks aim for a higher PH, and the majority do have shells as decor or in the filter. I have noticed a drop to 7.8 if I donít conduct a water change in a couple months, but for the most part every one (5 tanks, from African cichlids to Sulawesi shrimp) sticks to a steady 8.0. The .4 drop in PH happens fairly quickly and consistently so I figured Iíd ask.
Do you have any pictures of your Sulawesi shrimp? ( Sorry, off topic)
I would really like to see them.
Maybe start a journal discussing their care.


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post #6 of 6 (permalink) Old 07-23-2019, 01:35 PM
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Originally Posted by DiscusStu View Post
Nitrification consumes alkalinity and produces nitric acid.
Do your tanks explode much?
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