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Old 01-04-2008, 02:27 AM   #1 (permalink)
 
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Default Low pH problem?

My pH keeps slowly dropping on my tank.
Using my pinpoint pH controller I noticed that my pH has dropped to around 5.6 and is staying there.
I tried a recalibration but the controller was set correctly.
I thought it could be the co2 dropping the pH but this is the morning reading.
Overnight the tank is aerated with the co2 turned off.


Does anyone have any suggestions on how to keep my pH up?

75g aquarium
96x3 pc lighting 5 hrs per day
press co2
moderate to heavy planting level
pps pro fert
tap pH 6.5
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Old 01-04-2008, 03:19 AM   #2 (permalink)
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Default Re: Low pH problem?

I've found that the ph isn't that important as long as it doesnt swing too widely. If you need a set ph for a cichlid tank etc, then maybe you should test your controller you said its calibrated, but is it reading properly?. Did you test ph with a liquid kit to double check controller? You could also try buying the ph up or down liquids to set it where you want it. Is your probe in a good spot to read accurately, away from major currents?
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Old 01-04-2008, 04:47 AM   #3 (permalink)
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Default Re: Low pH problem?

What is carbonate hardness in your tank? If its low, then pH-value can go up and down. I use very simple trick to raise kh-value:natriumbicarbonate. We have very soft water here in Finland and I need to raise waterhardness to keep pH steady.
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Old 01-04-2008, 08:48 AM   #4 (permalink)
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Default Re: Low pH problem?

Quote:
Originally Posted by KatjaT View Post
What is carbonate hardness in your tank? If its low, then pH-value can go up and down. I use very simple trick to raise kh-value:natriumbicarbonate. We have very soft water here in Finland and I need to raise waterhardness to keep pH steady.
I agree with Katja. KH is most propably the issue related with your problem. If you have a very soft water, then the ph can trend to have a lot of variation. Higher KH value (I would say 4 o more) bring more stable pH value and serve as buffer to it, it also allows a better control of CO2 level. You can raise it using baking soda in your water.
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