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Re: [APD] CO2 and pH control
My resting tap water now shows 8.6. I'm not sure why I previously tested
at 9.3. My tank has a laterite sublayer with "inert" aquarium gravel on
top. Decorations are petrified wood. Trickle filter has a floss
prefilter and bioballs.
Jerry Baker wrote:
>Gordon and Susan Watkins wrote:
>>The pH reading is coming from the sump of my trickle filter using a
>>Milwaukee controller. Right now, with CO2 running, it shows 8.1. I
>>checked another tank which has been set up continuously for over 25
>>years and, using the same electrode, it showed 8.9. What else could
>>account for the discrepancy?
>You could have gravel or decorations which are buffering your pH. Things
>like shells, coral, limestone, marble, etc. will do that.
>I intended to ask what is the pH of the tap water after it has sat out
>for awhile (not in an aquarium).
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