Hello....

I just tested the water from my co2 injected aquarium at 7pm, and the lights
have been on for 7 hours The results we
ph=7.5
kh=18
I then tested the ph from my tap water and it was at 7.0.....
Does this sound right?
Why would my ph be increased with co2 injection?
It's not like i'm using limestone for substrate. Has anyone else had problems
with Hagen test kits?
Other conditions of my tank:
29gal
DIY Co2 injected into intake of whisper 2 filter.
110W compact flo.
Sand with bottom layer of kitty litter.

TIA
Neight Goetz