Ph 8.4 how to reduce?

[jarrett shark]

Well I am just preparing until my new ph probes come in. I don't have calibration fluid so I can't tell if the ones i have now are accrate but I think it is because I tried 4 old probes and all close in readings. I have been losing sps and maybe this is the problem. My ph at night is only 8.2
how do you reduce???
My levels are
Alk-8.8
Cal-425
Mag-1300
po4-.03
Salinity -1.025
Ph-8.2-8.4
I do water changes once a week and I always had problems keeping my ph up because my sump is in basement and tank is in my office with no windows. I had to use Kalk to bring it up but have not used in 6months ever since I been seeing my ph first be in the 8.2 range.
I do keep my frag tank lights on opposite time of DT so not sure if I shops not do this anymore?

 

[jimrawr]

Nothing wrong with 8.2-8.4

 

[kevensquint]

8.2 is very acceptable, its actually my prefered ph, high enough for a healthy tank, but not so high that the pumps jam every two days.

 

[jarrett shark]

8.2 is the lowest it reads on my graph of apex and that is at night... The highist it gets during the day time is 8.49 and average is 8.39-8.42. And you that is fine??? It's just weird that sps not happy and even looks like I am getting what alk burn looks like on the sps

 

[Gary Majchrzak]

8.2 is the lowest it reads on my graph of apex and that is at night... The highist it gets during the day time is 8.49 and average is 8.39-8.42. And you that is fine??? It's just weird that sps not happy and even looks like I am getting what alk burn looks like on the sps

your pH isn't the problem. Look elsewhere.

 

[Randy Holmes-Farley]

I agree that pH is just about perfect if accurate, and if you have not calibrated the probe, it may not be accurate.

These have more:

The "How To" Guide to Reef Aquarium Chemistry for Beginners, Part 3: pH
http://reefkeeping.com/issues/2007-05/rhf/index.php

Low pH: Causes and Cures
http://reefkeeping.com/issues/2004-09/rhf/index.htm

High pH: Causes and Cures
http://reefkeeping.com/issues/2005-03/rhf/index.htm

 

[jimsplace]

I agree with the others ph is not your problem. I would check your alk with a second kit it sounds to me like alk swings. How regularly do you check your alk numbers? Are you carbon dosing or using biopellets? How big of a water change are you making?