PH dropping - The Planted Tank Forum
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post #1 of 22 (permalink) Old 12-02-2006, 04:30 AM Thread Starter
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PH dropping

I use to pump CO2 into my tank, but I stopped when I noticed that the PH was dropping on its own. It is below 6 and I'm wondering why? I have a 110 gallon tank that is well planted and about 12 Discus.What could be the reason?

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110 gallon Discus tank
65 gallon Discus tank
30 gallon Discus tank
20 gallon standby tank
10 gallon quarantine
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post #2 of 22 (permalink) Old 12-02-2006, 12:15 PM
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CO2 will lower pH. That's pretty common knowledge.
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post #3 of 22 (permalink) Old 12-02-2006, 02:50 PM
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yup that the reason, as long as you keep it stable it shouldnt be too much of a problem


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post #4 of 22 (permalink) Old 12-02-2006, 03:08 PM Thread Starter
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Quote:
Originally Posted by Rex Grigg View Post
CO2 will lower pH. That's pretty common knowledge.
Yes I know that CO2 drops the Ph, but as I have said I have stopped pumping CO2 into my tank 3 weeks ago and it continues to drop on its own. Are the plants causing this?

110 gallon Discus tank
65 gallon Discus tank
30 gallon Discus tank
20 gallon standby tank
10 gallon quarantine
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post #5 of 22 (permalink) Old 12-02-2006, 03:23 PM
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Are you doing water changes? What is the KH ?
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post #6 of 22 (permalink) Old 12-02-2006, 03:41 PM
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If you have driftwood in there, it could be leaching tannins. This will drop the PH also.
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post #7 of 22 (permalink) Old 12-02-2006, 05:20 PM
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And how are you testing? If its a handheld digital, the probes go wacky after about a year and have to be replaced. Otherwise its new water or possibly drift wood like Mark mentioned.





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post #8 of 22 (permalink) Old 12-02-2006, 05:24 PM Thread Starter
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Will check all this and get back to the discussion.

110 gallon Discus tank
65 gallon Discus tank
30 gallon Discus tank
20 gallon standby tank
10 gallon quarantine
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post #9 of 22 (permalink) Old 12-03-2006, 03:25 AM
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In my experience old tanks which have not been cleaned regularly could suffer from all sorts of problems(old tank syndrome) ,and dropping PH is one of them.
do you clean your tank's substrate ,filter media often ?I would recommend to do a couple of WC and no co2 to see where it takes you.
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post #10 of 22 (permalink) Old 12-03-2006, 04:27 PM
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There is no need to stop pumping CO2 just because your pH is below 6. New substrate like Soilmaster can do that. I hope you didn't stop your CO2 just because of the pH. You will get one hell of an algae bloom if you did. test your KH and put your parms on here so we can help. Also tell us what you did recently....add hardscape, change substrate, how old is tank...etc.
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post #11 of 22 (permalink) Old 12-03-2006, 05:19 PM Thread Starter
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Quote:
Originally Posted by fresh_newby View Post
There is no need to stop pumping CO2 just because your pH is below 6. New substrate like Soilmaster can do that. I hope you didn't stop your CO2 just because of the pH. You will get one hell of an algae bloom if you did. test your KH and put your parms on here so we can help. Also tell us what you did recently....add hardscape, change substrate, how old is tank...etc.
Well here are the results.

First, yes I do have a piece of drift wood in the tank since last January. My tank is planted and the plants are growing well to the point where I have to cut back the growth. I also have 2 rocks in there I got from my LFS last January. That is basically when I setup this tank. I have 2 filters, eheim 2028 and XP3, 1 UV and a CO2 reactor. By the way I started up the CO2 again as asked to do so. I did (do) have an algae problem that I somewhat remedied with Flourish. The algae is red on the plants which should signify that it is dead. It use to be black. 13 discus, 5 octos, 1 loach and too many snails!

Test results:

Ph - 5.89 (liquid and also monitor results)
ammonia - 0ppm
nitrite - 0ppm
nitrate - 10 - 15 ppm
kh - 2dKH

Thanks.

110 gallon Discus tank
65 gallon Discus tank
30 gallon Discus tank
20 gallon standby tank
10 gallon quarantine
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post #12 of 22 (permalink) Old 12-03-2006, 08:17 PM
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I would keep monitoring the situation and doing your water changes. If your wood and rock were in there since janualry, I doubt that it has anything to do with a sudden pH change. When was the last time you calibrated your pH probe. Also, do you have a pH controller? Is it located by a MH ballast? All questions to consider.
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post #13 of 22 (permalink) Old 12-03-2006, 09:16 PM Thread Starter
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Quote:
Originally Posted by fresh_newby View Post
I would keep monitoring the situation and doing your water changes. If your wood and rock were in there since janualry, I doubt that it has anything to do with a sudden pH change. When was the last time you calibrated your pH probe. Also, do you have a pH controller? Is it located by a MH ballast? All questions to consider.
I'n not saying there is drastic change in Ph. what I was saying was that even without the CO2 injection in to the tank, Ph was maintaining and has gone down a little. I clibrated the monitor last week and the liquid test also confirmed the monitor was working properly. No Ph controller.

110 gallon Discus tank
65 gallon Discus tank
30 gallon Discus tank
20 gallon standby tank
10 gallon quarantine
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post #14 of 22 (permalink) Old 12-04-2006, 01:38 PM
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I've read a little about seachem's products and if I recall correct, Flourish excel (if that's what you used to kill the algea) is originally designed to add CO2 to your tank and not to kill algea (what most people use it for). Isn't it possible that your PH lowered because of the added (overdose) flourish excell?
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post #15 of 22 (permalink) Old 12-04-2006, 07:35 PM Thread Starter
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I've read a little about seachem's products and if I recall correct, Flourish excel (if that's what you used to kill the algea) is originally designed to add CO2 to your tank and not to kill algea (what most people use it for). Isn't it possible that your PH lowered because of the added (overdose) flourish excell?

Hmmm did not think of that. There is a good possibility you are right. How long does the effect of Excel continue??

110 gallon Discus tank
65 gallon Discus tank
30 gallon Discus tank
20 gallon standby tank
10 gallon quarantine
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