How important is the PH. I have never tested my PH before. I had two Ottos that died and the lfs checked my water and said that they could not believe how high my PH levels were (I did not get an exact number as they said it was off their charts). I went to another store that told me not to fool around with the PH as this is harder on the fish. She got readings of around 8+ What is the right thing to do here as I have 6 fish in my tank right now and I don't want to harm them by this.