I have just tested my tanks and the readings are as follows:-
1st tank: 7.2 PH
GH 197ppm
KH - 3
2nd tank PH 6.4
GH 197ppm
KH 3
Zebra tank: PH 7.6
GH 237ppm
KH 3
I can't understand why there is such a difference in PH and, I would like help in understanding the difference in GH and should I be worried about the low KH of 3 in all tanks. I, obviously, don't want to experience a PH crash in any of the tanks.
Thanks
Jenny