pH went down for no reason????? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 04-05-2006, 05:59 PM Thread Starter
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pH went down for no reason?????

For some reason my pH is down to 7.4-7.8 from 8 where it was. I've been testing exactly the same way (test tubes), and I haven't done anything different. My tank is practically done cycling so that's the only change. My tap water shows 7.8 pH, the same it did a month ago (water co says it's 7.76).

Will it go down when the nitrites get to zero? Which is the only coinciding event that has happened. I really don't think that's true, but can't think of any other reason.

oh. I did change how the air pumps were running, from all the time, to just on at night. maybe that change the releasing of CO2 and helped our pH to go down.

I DON"T KNOW!!! weird!

Thanks everyone. I'm really not upset, I'm actually really happy, cause the fish I want are 7.0 pH fish. But I also want it to stay down and not go back up!

Thanks everyone!
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post #2 of 7 (permalink) Old 04-05-2006, 06:10 PM
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Are you doing water changes?

Your cycling may have had an effect on the pH. One of the byproducts of the conversion of ammonia to nitrate is nitric acid, which will lower your pH.

If you do frequent water changes, and/or have a high kH, you won't see much pH swing. If you don't, your pH can go down quite a bit. It can even go so low (below 5) that it will affect your biofilter (the so-called "crash" that some talk about).
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post #3 of 7 (permalink) Old 04-05-2006, 08:17 PM
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Quote:
Originally Posted by crissy7399
oh. I did change how the air pumps were running, from all the time, to just on at night. maybe that change the releasing of CO2 and helped our pH to go down.
I think you nailed the answer right here.
When did you measure your ph, I bet you did it when the air pump was off for a while.

If you do it before the lights go on in the AM, I think you'll get your 7.8.

Walter

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post #4 of 7 (permalink) Old 04-05-2006, 10:16 PM Thread Starter
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Originally Posted by tazcrash69
I think you nailed the answer right here.
When did you measure your ph, I bet you did it when the air pump was off for a while.

If you do it before the lights go on in the AM, I think you'll get your 7.8.
I probably did do it after it had gone off. I'll try it again in the morning before they turn off.

Yikes! Isn't that bad? I had read a lot of people do that for their planted tanks.

The wierd thing is.. I just posted this on another thread...is that I bought a KH/GH test tube kit and it shows my KH at 110!!!!

I guess I'm just all around confused. I'm trying to do everything right. I'm not going to do CO2 injections, that's why I did the air pump off during the day to minimize CO2 loss.

well. i guess I still need help!
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post #5 of 7 (permalink) Old 04-05-2006, 11:08 PM
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pH will come down naturally over time as your water ages also. This is due to the byproducts of decomposing waste (fish, dead plant matter, etc.).

Eric


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post #6 of 7 (permalink) Old 04-05-2006, 11:21 PM
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Fish don't require a specific PH. In nature the PH of lakes and streams changes throughout the day and night, just as it does in our tanks. As long as you aren't seeing PH below 6, with no CO2 I wouldn't worry about it as far as the effect on fish is concerned.
What are your KH and GH?

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post #7 of 7 (permalink) Old 04-06-2006, 05:18 AM Thread Starter
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Well, I think you just posted on my other KH/GH question I wrote today Hoppy!

But the ppm was GH 160 and KH 110. It took 8 drops for the GH and 11 for the KH.

The conversion table to dH* or /ou/o / gH* is

GH 160 x .056 = 8.96
KH 110 x .056 = 6.16

I was thinking that pH didn't matter as long as it was stable. So stability isn't that big of an issue either? I thougt just moving a little bit was really a big jump because every "point" is really 10 "points" or is it 100? (I don't know what to call the "points" sorry)

Thanks guys.

All these answers make sense. But now I'm wondering if I should leave the air pump off all the time? it's not doing a whole lot cause I have it turned down. I just wanted to make sure the fish get the oxygen they need. My tank isn't fully planted, it just has 5-6 plants.

THANK YOU!!
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