Hi, I have 1 oscar in a 125 gallon aquarium. I noticed the PH is quite high about a 8.3- 8.4. I tested my tap water which came out to a 8. I do have some granite rocks in the aquarium which I did do tests on and cleaned them before I set the tank up. Are the rocks the reason that the PH has jumped up? what should I do to help stabilize the PH or am I over reacting (everywhere I have read said 6-8ph for an Oscar). Thank you for everyone's help and opinions!