Don't worry about the PH. But out of curiosity,test it out of the tap,then leave some out in a glass for 24 hours,and test it. Like BFM said,it is probably the dead coral raising it,but this would let you know for sure.
And if you have ammonia in your tap,switch your water conditioner to Prime.
And if you have ammonia in your tap,switch your water conditioner to Prime.