Large pH drop? - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 02-21-2014, 12:50 PM Thread Starter
Algae Grower
 
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Large pH drop?

Hi,
I have a 125 planted tank with quite a few fish. It runs two canister filters and has a Digital Aquatic pH controller for pressurized CO2, and moderate light. I keep my pH at 6.70 during the photoperiod. At night I turn off the CO2 and turn on an airstone. My pH goes to 7.35! I have just done a two-point calibration of the probe and checked these figures with an ATI chemical test kit.
That sounds like a very large change in CO2 content from day to night. It is consistent, in that I see it every night for weeks. The fish are very happy and the plants grow well without algae.
Can this be right? Am I tempting fate? I don't recall my KH, but it was nothing weird last time I checked, maybe 8-9.
Thanks for your ideas,
Dave
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post #2 of 2 (permalink) Old 02-21-2014, 12:55 PM
Obsessed? Maybe
 
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That's nothing to worry about.

The carbonic acid from CO2 is what makes your probe read in the sixes. It's not actually changing the hardness of your water or altering mineral content, so a swing like that is nothing. Totally normal.


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