If you have an air stone and a air pump, get a glass of water out of your aquarium, and put the bubbler in it for 3 hours. That will remove the co2, then you can test for your actual ph. That will also help understand how much co2 is in the water.
Standard 10 Gallon (20 x12x12).
Low tech, Sand substrate.
Eheim 2211, and Aqueon Quietflow 10.
Finnex Stingray LED, 20" above substrate
2 Anubias Nana Petite, Christmas moss.
4 Halequin Rasborahs, 5 RCS.