No problem with your pH. The KH should help buffer any dramatic change in pH from the CO2.
Your Nitrate (NO2) is a bit high. It should be 0. I'd do a water change to get it down.
50G Mixed reef:
ORA misbar True Percula clown, Yasha goby and Pistol shrimp pair, 3 Sexy shrimp, Filamented Wrasse, various soft, LPS, and SPS corals.
100G (48x48x12) frag and 125G reef in the works.
Posts: 1,513
Your Nitrate is a bit high and you should be reading 0 for Nitrite in a fully cycled tank. Did you test for Ammonia? Don't worry so much about pH since stability is more important than the actual number in the vast majority of applications.