pH Swinging, Why? - The Planted Tank Forum
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post #1 of 29 (permalink) Old 09-09-2011, 02:48 PM Thread Starter
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pH Swinging, Why?

I just noticed in one of my tanks my pH has really been swinging. I top off with water that is 8.0+ and when I add it to my tank it's about 7.8. By the next morning it's 6.

I have shrimp so I'm concerned.

All I have in this tank are some plants, a piece of driftwood, Flourite Black and an airstone. I'm considering getting some local river rocks because I have them in another tank that's at a stead higher pH.

Any thought?
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post #2 of 29 (permalink) Old 09-09-2011, 02:58 PM
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do you test the KH level on your water?
8pH to 6pH is a huge shift (imo)


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post #3 of 29 (permalink) Old 09-09-2011, 03:26 PM
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If the pH of the tap water is really 8 I'd think the KH would be pretty high too. Our CA tap is about 7.5 and kh is always nearly 11. But ours is high due to the chlorination method they use. Most all water providers boost the pH to prevent pipe corrosion. Don't think there is a way they can do that without raising the kH at the same time.

As far as shrimp it depends on what type your are keeping. It may not really matter.
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post #4 of 29 (permalink) Old 09-09-2011, 03:38 PM
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This thread ran it's course last night on a similar topic, high pH tap and a tank pH crash.
Cali tankers,, you folks sure have weird water.
https://www.plantedtank.net/forums/fe...-ph-kh-gh.html

My tap is crap but at least simple to figure out.


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post #5 of 29 (permalink) Old 09-09-2011, 03:41 PM
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Actually, my water is really soft but it still comes out of the tap at around 8.0; Hadley, do you let your water sit at all? I try to let me water sit overnight, and the pH goes down to around 7.0. If it's a shrimp tank maybe the volume is small enough you can do that?

Joy to the fishes!
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post #6 of 29 (permalink) Old 09-09-2011, 03:44 PM
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Quote:
Originally Posted by wkndracer View Post
This thread ran it's course last night on a similar topic, high pH tap and a tank pH crash.
Cali tankers,, you folks sure have weird water.
https://www.plantedtank.net/forums/fe...-ph-kh-gh.html

My tap is crap but at least simple to figure out.
It has a lot to do with where you are at. I have the same thing happen. It has to so with water treatment and the chemicals used and your plumbing out here. We have very soft water from snow melt. I think your water comes from wells and is affected by your geography.


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post #7 of 29 (permalink) Old 09-09-2011, 04:12 PM Thread Starter
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My kH is 9 - 10. And it does not come from a well, it comes from Hetch Hetchy. I'm keeping Tiger shrimp.

I can easily leave the water out over night and see what happens, however, my pH in the tank is still dropping to 6 after adding untreated (with pH buffer of any kind) from my typical pH.

I'll be sure to check out the other thread but any help would be really appreciated.
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post #8 of 29 (permalink) Old 09-09-2011, 04:21 PM
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What is the tank water's KH? The local rock may be a good thing.


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post #9 of 29 (permalink) Old 09-09-2011, 04:33 PM Thread Starter
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My kH is between 9 - 10.

I'm thinking I'm going to get some local rock tomorrow.
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post #10 of 29 (permalink) Old 09-09-2011, 04:50 PM
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sorry, I'm easily confused is this 9-10ppm or 9-10dKH?


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post #11 of 29 (permalink) Old 09-09-2011, 04:52 PM Thread Starter
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dKH
and it's ok I'm easily confused too.
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post #12 of 29 (permalink) Old 09-09-2011, 04:56 PM
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I believe something is wrong here in the testing method, a full 2 point drop with that much buffer present would be difficult to say the least by any means I'm aware of.

hope you figure this one out as I haven't a clue now.

LAME! ??? a typo or am I being slow again LOL


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post #13 of 29 (permalink) Old 09-09-2011, 05:05 PM Thread Starter
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LAME! I mean not your fault at all but I'm baffled too. I know some other aquarists who have had issues with ph because of things in their tank such as driftwood, rocks ... So I'll go get some of that magical river rock and see what it does to my ph.

Does anyone have any feedback on how my shrimp are going to fair?
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post #14 of 29 (permalink) Old 09-09-2011, 05:08 PM
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Hetch Hetchy water is not at all hard. It is snow melt water. I can't believe your tap water, if it is from Hetch Hetchy can have that high a KH. San Francisco water is certainly not that high.

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post #15 of 29 (permalink) Old 09-09-2011, 05:16 PM Thread Starter
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Quote:
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Hetch Hetchy water is not at all hard. It is snow melt water. I can't believe your tap water, if it is from Hetch Hetchy can have that high a KH. San Francisco water is certainly not that high.
I really don't know what to say, I tested it and those were my results. I can test again when I get home.

It's the the first time I've tested.
My water comes from Crystal Springs which is filled with rain water and Hetch Hetchy water...Maybe it's my building? I live in a large, older condo buildling.

Is there a more effective way to test other than my drop tester?
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