Not sure about ph. That's the only thing I didn't check because I was out of the sample water from the tank, and I just didn't bother to go back because I wanted to test the other tank (which was reading 0ppm across the board, another fish-in cycled tank which couldn't have been easier. Hmmph.). I was really surprised to see no nitrites after they steadily climbed for a few days, and I was bummed because I thought my cycle crashed somehow, but I checked nitrate anyway and saw 5ppm...then I was just confused. I had to add a little more water to compensate for evaporation, I'll check everything again tomorrow night and see where it's at in another 24 hours.