Since nothing is in the tank and it has not cycled the PH should be fine. However w/ two times and hour turnover it's no surprise it's not. You need to increase that by 5x to be at the minimum of whats recommended for SW
/reefs. Increasing the turnover will allow gas exchange between the tank and the air in the room. Lack of gas exchange leads to excessive amounts of CO2
accumulating in the water. That drives PH down. Increase the flow, then cycle, then monitor PH. As said PH will be low during the cycle due to the amount of acids being produced.
I purchased four more powerheads aand will add three of them to the tank.
Good. Point one or two so that they disturb the surface of the water. Surface agitation allows for better gas exchange.