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Dan_P

Advanced Reefer
Location
Connecticut
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When my pH seems like it has slipped a bit, I recalibrate my pH probe. I try to schedule a recalibration every 1-2 weeks (that is probably too long of a period if you are controlling dosage on pH).

I also have noticed pH slippage can correspond to decreased alkalinity in my tank (a drop of 0.5-1.0 mg/L). I usually see a small pH increase, 0.05-0.1, when I raise it with sodium bicarbonate.

Poor gas exchange exchange with air and CO2 build up could bring pH down, but it is hard to image that being the case with skimming, powerheads and recirculating through a sump. In winter with potential CO2 build up indoors, even with good air exchange, low pH could be an issue.
 
Location
Bronx
Rating - 100%
34   0   0
When my pH seems like it has slipped a bit, I recalibrate my pH probe. I try to schedule a recalibration every 1-2 weeks (that is probably too long of a period if you are controlling dosage on pH).

I also have noticed pH slippage can correspond to decreased alkalinity in my tank (a drop of 0.5-1.0 mg/L). I usually see a small pH increase, 0.05-0.1, when I raise it with sodium bicarbonate.

Poor gas exchange exchange with air and CO2 build up could bring pH down, but it is hard to image that being the case with skimming, powerheads and recirculating through a sump. In winter with potential CO2 build up indoors, even with good air exchange, low pH could be an issue.

i just recalibrated my probe a few days ago have to purchase more calibration solutions i might calibrate every month going forward Alk is pretty steady around 7.50-8.0 i dose using a dosing pump
 

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