mysterious PH swing

[sealed]

40 gal dis. reef w 20 gal sump

2/27 Ph 8.2 DKH 11
3/4 PH 8.3 DKH 10
3/10 PH 8.3 DKH 10
3/14 Ph 8.3 DKH 10
3/14 Added G Bubble tip anemone and small drag of GSP
3/15 Ph 8.6 DKH 10 ( 10 gal water change)
3/16 Ph 8.6 DKH 10

Calc has stayed at abt 490 ppm
Haven’t done anything expect addition of livestock above (3/14)
What’s up with this spike in PH?

 

[Dan_P]

40 gal dis. reef w 20 gal sump

2/27 Ph 8.2 DKH 11
3/4 PH 8.3 DKH 10
3/10 PH 8.3 DKH 10
3/14 Ph 8.3 DKH 10
3/14 Added G Bubble tip anemone and small drag of GSP
3/15 Ph 8.6 DKH 10 ( 10 gal water change)
3/16 Ph 8.6 DKH 10

Calc has stayed at abt 490 ppm
Haven’t done anything expect addition of livestock above (3/14)
What’s up with this spike in PH?

How is the pH measured? How do you know that it is correct?

 

[sealed]

How is the pH measured? How do you know that it is correct?

Hanna Checker pH test, tested 3 times on 3/15 and 3/16. Used API as well, tested at 8.2 (ish). Hanna Checker tests at 8.6.
I would assume it came accurate as possible from factory.

 

[Dan_P]

Hanna Checker pH test, tested 3 times on 3/15 and 3/16. Used API as well, tested at 8.2 (ish). Hanna Checker tests at 8.6.
I would assume it came accurate as possible from factory.

There could be a testing error but let’s assume the number is nearly correct.

The change is a drift upwards not a spike. Lower CO2 in the home could be the reason. Better circulation or aeration of aquarium water couldbe another.

 

[Randy Holmes-Farley]

Hanna Checker pH test, tested 3 times on 3/15 and 3/16. Used API as well, tested at 8.2 (ish). Hanna Checker tests at 8.6.
I would assume it came accurate as possible from factory.

Meaning you did not calibrate it? Assuming calibration is correct on day 1 of a new meter is not generally correct.