pH question

[Thor2j]

My tank has been up for a little over a month. Never cycled. Started with 140 lbs of live rock fully cured and live sand. Somewhere around 115gallons of water. My pH religiously only fluctuates between 7.87-7.99 on calibrated apex. Red sea usually shows right at 8. When I do water change the new RSC water shows about 8.4 ph. I did 26 gallons the other day. Initially pH went to about 8.07. Then it plummeted to 7.65. After a few days back up to 7.95ish.

Questions, why the plummet shortly after water change??? Have a couple zoas and a mushroom frag, would like to raise pH a little. Have doser but haven't started using it do to my very light coral load. DkH is 7.9. Of I raise that a little pH will follow correct??

Thanks

 

[71xlch]

Bigger question is why chase numbers? Is there an issue or are you making it an issue. Hardest part for me in reefing was trying to get my tank to follow other people's tanks numbers

 

[Thor2j]

Bigger question is why chase numbers? Is there an issue or are you making it an issue. Hardest part for me in reefing was trying to get my tank to follow other people's tanks numbers

My main question is why the big dip in pH after water change. Wondering how it physically makes sense. Also going from 8 to 7.6 in a few hours cant thrill the fish.

 

[71xlch]

.4 doubt it makes a difference. Randy has a great article on PH and I'm sure he will chime in. My biggest issue is it has been so hot out the house is completely closed up which raises the co2 in the air. Then my skimmer sucks all that in, infusing it into my tank lowering the PH.

 

[71xlch]

Found the one article. Has many that are great. http://www.reefkeeping.com/issues/2004-09/rhf/

 

[Randy Holmes-Farley]

How are you measuring pH?

If a probe, is it getting exposed during a change?

 

[Thor2j]

How are you measuring pH?

If a probe, is it getting exposed during a change?

With apex during change.. No, probes are not getting exposed during change.

 

[Randy Holmes-Farley]

I cannot think of any reason pH would drop if the pH and alk and temp of the new water is OK, and I think it more likely to be an artifact of some sort.