Not seeing a ph bump using 5500ml of kalk

[DudeReefer]

My ph is at 8.1 during the day and 7.88 at night dosing 5500ml(3.8ml a minute)of kalk from an avast marine kalk reactor. Before I used kalk I was at 7.8 low at night. I am also using the same amount of Red Sea nopox(8ml a day). Is there any reason why I am most seeing a bigger ph bump? I am only using kalk to keep my dkh at 9. Everything in the tank is happy. Just wondering why ph is still suppress. According to calculations I should see a .3-.6 bump in ph in my 180 gallon.

 

[*GAREEF*]

More than likely you need to decrease co2 in your system. I bought a co2 air monitor for $40.
The co2 in my house was around 700 at night.
Small house two people and 3 large dogs.
I was able to lower co2 by cracklings window open that is a couple a feet away from my tank.
I had the same ph numbers as you pretty much.
After cracking the window my ph is now a low of 8.2 and high of 8.5.

 

[bubbgee]

Nopox is carbon dosing and will drop your pH. Try stopping Nopox for a night and see if that helps. Then you need to dose Nopox in the daytime to prevent it from affecting pH at night.