Alkalinity in range pH really low

[lilbitreefer]

Can anyone tell me why my pH would suddenly drop despite my Alkalinity/Ca being in range. I have been dosing daily but after this weird pH plummet I am scared to dose any more at this time. Any thoughts.

pH .7.81
Alk 9.07
Ca 418

For some reason I can't tmark up the picture but you can see the straight spikes in pH are where I have been dosing daily. I have been dosing about 25mL a day of Ca/alk for the last few days but then this sudden pH drop.

Should I keep dosing or wait?

 

[Randy Holmes-Farley Verified Community Expert]

pH is determined by CO2 and carbonate alkalinity. Low pH at normal alkalinity is typically due to excessive CO2 in your home air.

 

[Reefer1978]

And it's the day after Thanksgiving, I am guessing you had some family over at your house the day before... I am with Randy, your ambient CO2 went up.

 

[lilbitreefer]

wow didnt think of that. thanks

 

[UCF Alum]

Can anyone tell me why my pH would suddenly drop despite my Alkalinity/Ca being in range. I have been dosing daily but after this weird pH plummet I am scared to dose any more at this time. Any thoughts.

pH .7.81
Alk 9.07
Ca 418

For some reason I can't tmark up the picture but you can see the straight spikes in pH are where I have been dosing daily. I have been dosing about 25mL a day of Ca/alk for the last few days but then this sudden pH drop.

Should I keep dosing or wait?

Same problem here!! Check my pH Poll thread and you’ll see what I’m saying.