lowering your PH

[ReeferRob]

Sorry I didn't notice your reply back before now... I think 10 is an erroneous result. Unless you're adding something to raise pH, I can't see it ever getting that high on it's own. Not to mention I would guess that many creatures would start to perish with a pH that high.

Before you do any adjusting, you need to get another test from a different kit or method.

(BTW - I merged your new thread with this older thread and moved it to beakerbob's chemistry forum.)

I believe he was referring to the time of day that he tested the water Jim.

Like others had mentioned, get a 2nd or even a 3rd test by a LFS or local refer.
Do a water change first if your truly concerned of the elevated levels. I've been curious of sometime what the actual "danger zone" is for our reefs as mine typically hangs out around 8.4-8.5 too.

[jimsflies]

Ah...yeah, I guess I see that now. That's why units are helpful... pH = 8.4 s.u. or 10 am.