High PH readings...how do I lower?

[Klems]

Tank has been running over a year and a half and for the past the PH has been between 8.15 - 8.35 on a daily basis....went out of town for the weekend and when I returned, PH is now at 8.56 in late afternoon and low of 8.28 overnight....

How can I get it to lower into a more favorable range?

 

[Flagg37]

8.5 really isn't that high. Are you using kalkwasser? It will slowly raise your pH over time.

 

[Coral reefer]

Don't chase the numbers. Is your probe calibrated? Corals look ok?

 

[Klems]

No, I do not use kalk....

Yes, corals look good and are open..

Probe was calibrated about 3 months ago...

 

[Vhuang168]

Are you dosing at all? I would calibrate the probe again. The numbers aren't overly high.


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[Klems]

Yes, I was manual dosing Red Sea alk and Cal- in the morning each day before this last weekend...and the daily pH levels were 8.14 in the morning and 8.35 in late afternoon

Alk levels are 10.5, Cal at 500 and Mag at 1350

 

[rygh]

Probably just a dirty probe out of calibration.
I strongly suggest you do not try to "fix" it.
The only thing I might check is to make sure you have proper tank aeration.
Good surface flow and agitation. Properly working skimmer.

Great details here:
http://reefkeeping.com/issues/2005-03/rhf/

 

[Klems]

Dirty probe is the winner.....went from 8.54 down to 8.28.

Thanks all!