Is this a normal ph swing

[TLO45]

I know ph comes up more frequently these days and with more controller based systems can measure more areas of our reefs.
I’m curious what people think about the daily swing of my ph on a day to day basis?
I run my Alk at ~8.5 but am wondering if some feel if I ran it closer to 9dkh if the swing would tighten up some?
Thoughts?

 

[Randy Holmes-Farley Verified Community Expert]

Looks pretty normal to me. More aeration will reduce it. Raising the alk from 8.5 to 9 dKH will not much much of a difference.

 

[TLO45]

Appreciate your help!