my ph is low? - The Planted Tank Forum
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post #1 of 24 (permalink) Old 01-31-2010, 11:30 PM Thread Starter
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my ph is low?

I havent tested my water in like 3 months. This tank has been up and running ever since september and I didnt really add many fish. Just have 3 ottos and 5 corys. At least 14 blyxa japonica plants, watersprite and a crypt for my 12 gallon tank.

I do waterchanges every week 45% and dose using the EI method and run pressurized co2 for the last 2 weeks (injected via powerhead).

Before with my DIY co2 the ph would be around 6.8 or 7.5.

But now here are my results.

ph 6.0
gh 3
kh 4
NO2 <.3mg
nh3 0

But what is up with these numbers? NO2 is bugging me because that number should be up if the tank is cycled right? Also I have a drop checker in the tank with its own mixture fluid from GLA, is showing Co2 (located 1.5 inches from the waterline on the other side of my power head)at optimal.


I tested my tap water just incase:
ph 8.0
gh 4
kh 5

any help would be appreciated.
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post #2 of 24 (permalink) Old 02-01-2010, 12:59 AM
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I don't see a problem. The nitrite test kit isn't so accurate that you can rely on it for anything without calibrating it, and you want the nitrite level to be below .3 ppm. The pH is perfectly normal for a tank with CO2.

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post #3 of 24 (permalink) Old 02-01-2010, 01:05 AM
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Test your tap water after sitting in a cup for 24 hours.
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post #4 of 24 (permalink) Old 02-01-2010, 03:01 AM Thread Starter
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Originally Posted by Hoppy View Post
I don't see a problem. The nitrite test kit isn't so accurate that you can rely on it for anything without calibrating it, and you want the nitrite level to be below .3 ppm. The pH is perfectly normal for a tank with CO2.
I just dont like my ph this low. I only notice when my PH is low is when my small snails all of a sudden multiply and is all over the place.

But if I also use the co2 table with the PH and the GH results it shows that im at an extremly high concentration of co2. Perhaps that is why my fish are getting a bit lazy.
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post #5 of 24 (permalink) Old 02-01-2010, 03:08 AM
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Originally Posted by accordztech View Post
I just dont like my ph this low. I only notice when my PH is low is when my small snails all of a sudden multiply and is all over the place.

But if I also use the co2 table with the PH and the GH results it shows that im at an extremly high concentration of co2. Perhaps that is why my fish are getting a bit lazy.
The CO2 table is irrelevant and useless in the aquarium. Read the whole page that hosts that table. That chart assume carbonate is the only thing effecting hardness.
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post #6 of 24 (permalink) Old 02-01-2010, 03:21 AM Thread Starter
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haha ic now. Cause with like 77ppm of co2 my fish wouldnt be breathing. lol.
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post #7 of 24 (permalink) Old 02-01-2010, 03:44 AM
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They would be breathing. Just not getting oxygen....
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post #8 of 24 (permalink) Old 02-01-2010, 06:33 AM Thread Starter
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is there anything I can do to raise it and keep it around 6.8? I just dont like these snails comming back.
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post #9 of 24 (permalink) Old 02-01-2010, 07:11 AM
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Try bringin up the gh, it will keep the ph a bit higher from what I hear. Not 100% sure so someone please correct if I'm wrong.
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post #10 of 24 (permalink) Old 02-01-2010, 07:17 AM Thread Starter
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I do have GH booster....ill look into it.

I thought that GH was just a buffer so that you wont have crazy ph swings?
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post #11 of 24 (permalink) Old 02-01-2010, 07:30 AM
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6.8 to 6 is a nasty swing
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post #12 of 24 (permalink) Old 02-01-2010, 03:08 PM
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Originally Posted by F22 View Post
6.8 to 6 is a nasty swing
No, it isn't. Changes in pH that don't occur very rapidly are not harmful. Anyone who injects CO2, and has enough for high light conditions, will have a pH swing at least as great as that.

I have never heard of pH having the slightest effect on snail population. Snails proliferate when you overfeed the fish, not when the pH is low.

In my opinion the best use of a pH test kit is as a paperweight.

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post #13 of 24 (permalink) Old 02-01-2010, 04:33 PM
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Low(relatively) pH has nothing to do with snails. You are seeing two unrelated events as one.

I agree with Hoppy that pH test kits should basically never be used. having stable KH and GH is important, but even that I do not measure(since I have liquid rock).
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post #14 of 24 (permalink) Old 02-01-2010, 07:40 PM Thread Starter
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Originally Posted by over_stocked View Post
Low(relatively) pH has nothing to do with snails. You are seeing two unrelated events as one.

I agree with Hoppy that pH test kits should basically never be used. having stable KH and GH is important, but even that I do not measure(since I have liquid rock).
Heh its just something that I have noticed here and there. When water changes come and ph goes up they dissapear lol...

Thanks guys for the tips.
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post #15 of 24 (permalink) Old 02-01-2010, 09:27 PM
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Originally Posted by accordztech View Post
When water changes come and ph goes up they dissapear lol...

If you are running a gravel vac over the surface of your substrate during water changes you are probably removing a lot of junk that is a food source for the snails...
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