That's Strange (pH) - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 06-29-2011, 05:28 PM Thread Starter
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That's Strange (pH)

So today I decided to check the pH in my tank. I have been soaking some manzanita wood in the tank for about 3 weeks now to water-log the wood and leach some of the tannins. I have also done about a 50% water change each week, and the filtration system has been running for about 1.5 weeks now. Today when I measured the pH in the tank, it came out to be around 6.5-7 (tested with both strips and drops, and both yielded the same result). This is strange because the pH of my tap water is about 6, and with the wood soaking in there I would have thought for sure that the pH would drop even more--but apparently it has raised my pH. Anybody else ever have this problem? I am slightly concerned about the difference in pH between the tank and tap for when I do water changes; I do not want to shock my fish and plants.

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post #2 of 9 (permalink) Old 06-29-2011, 05:47 PM
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I don't think it is because CO2 drops my pH everyday from 7.2 to 6.4 in an 10 hour span, so your ok.


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post #3 of 9 (permalink) Old 06-29-2011, 06:48 PM
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As I understand changes in PH due to CO2 injection are not harmful to tank inhabitants my tank fluctuates as much as 1.2 during a 24 hour cycle based on this. However significant rapid changes in PH caused by water chemistry variables can be very harmful.

Could the change in PH be caused by your substrate? or any of the rocks you may have in the tank?

I know for example that eco compelte will affect your ph in the short term but it will eventually stabilize.
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post #4 of 9 (permalink) Old 06-30-2011, 04:57 PM
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Originally Posted by KrazyFish View Post
As I understand changes in PH due to CO2 injection are not harmful to tank inhabitants my tank fluctuates as much as 1.2 during a 24 hour cycle based on this. However significant rapid changes in PH caused by water chemistry variables can be very harmful.

Could the change in PH be caused by your substrate? or any of the rocks you may have in the tank?

I know for example that eco compelte will affect your ph in the short term but it will eventually stabilize.
This is 100% correct. The over abundance of Co2 in the water compared to O2 is what harms the fish which Co2 injection.

Sorry OP I Have no idea what your issue is but I can tell you that the likelihood of both your liquid test and strip test being the same amount inaccurate are probably greater than actually getting a true reading from them both.

What else is in the tank? Substrate, filter media, water parameter adjusting agent?


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post #5 of 9 (permalink) Old 06-30-2011, 05:23 PM
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Originally Posted by FishFarmer View Post
So today I decided to check the pH in my tank. I have been soaking some manzanita wood in the tank for about 3 weeks now to water-log the wood and leach some of the tannins. I have also done about a 50% water change each week, and the filtration system has been running for about 1.5 weeks now. Today when I measured the pH in the tank, it came out to be around 6.5-7 (tested with both strips and drops, and both yielded the same result). This is strange because the pH of my tap water is about 6, and with the wood soaking in there I would have thought for sure that the pH would drop even more--but apparently it has raised my pH. Anybody else ever have this problem? I am slightly concerned about the difference in pH between the tank and tap for when I do water changes; I do not want to shock my fish and plants.
Have you ever tested the pH of your tap water after sitting in a cup for 24 hours? I ask this because it is very common for tap water to have dissolved co2 that would lower the pH, but then go back up after the co2 offgasses.
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post #6 of 9 (permalink) Old 06-30-2011, 05:33 PM
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Have you ever tested the pH of your tap water after sitting in a cup for 24 hours? I ask this because it is very common for tap water to have dissolved co2 that would lower the pH, but then go back up after the co2 offgasses.
This is what I have found to be true also. My tap water when tested right out of the tap is at pH of 7.0. After a day is has risen to 8.0 or even higher sometimes. This was due to co2 outgassing I was told by the local water supervisor. This is most probably what is happening to you.
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post #7 of 9 (permalink) Old 06-30-2011, 07:37 PM Thread Starter
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Okay, lets see if I can elaborate here.

The tank has 20 lbs of eco complete, about 10-15 lbs of Fluorite, some sand, and some rocks. I suppose the sand, eco, and rocks could have raised the pH some. And yes, I have tested my tap water after it has sat for a day or two before, but I honestly can't recall what the pH was. I'll have to do that again. And no, I have not added any water conditioners; I try to avoid them at all costs.

bsmith: I know that strips tend to be unreliable, but you think the liquid drop tests are as well?

Andy
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post #8 of 9 (permalink) Old 06-30-2011, 08:33 PM
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Totally unreliable unless tested against a known solution. I believe Hoppy has a thread about it in here some where.

What types of rocks are in the tank?


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post #9 of 9 (permalink) Old 07-09-2011, 08:11 PM Thread Starter
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Totally unreliable unless tested against a known solution. I believe Hoppy has a thread about it in here some where.

What types of rocks are in the tank?
I'm not sure what kind of rocks they are. Here's a pic of them in my journal: https://www.plantedtank.net/forums/ta...n-journal.html

I just got back from a week's vacation so I'll test again and see what the pH is like.

Andy
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