So the other night I added peat moss to my filter, since the my Ph was way to high. I tested the Ph with the test kit, and it said it was about 6.2 ppm. I tested it again about 5 hours later, and now it's saying the Ph is 7.6 ppm! Which is as high as the that bottle could go, so I got the high range Ph test kit, and it showed it was lower than 7.4 ppm. That's as far as that test kit goes down. Which one should I trust?