High PH

[Kurt Hammel]

My tank has been set up for 5 years now and a while back the PH started rising so I disconnected the CO2 scrubber but it keep climbing and now sits at 8.5 at night and climbs up to 8.69-8.7 in the day. What can I do to lower back down?

 

[shakacuz]

if you disconnected your co2 scrubber and your ph is still "climbing", i'd recalibrate your probe, and then test again with the probe and with another ph meter/tester.
i wouldn't be overly concerned, though.

 

[ISpeakForTheSeas]

Also, in case your pH actually is high, the "Solutions to High pH Problems" section of the article below may help:
https://www.reefedition.com/ph-and-the-reef-aquarium/

 

[Randy Holmes-Farley Verified Community Expert]

I too expect it is not accurate.

 

[FishLvR]

Dang that's like my tap water. MMM gritty.

 

[Kurt Hammel]

if you disconnected your co2 scrubber and your ph is still "climbing", i'd recalibrate your probe, and then test again with the probe and with another ph meter/tester.
i wouldn't be overly concerned, though.

I checked the probe calibration which read 7.14 instead of 7.01 and is only a couple months old. I will pick up a box test and see what it reads.