u mean with the temp i have, my ph is 6.4? wah... dont make me happy wor...
raw water is around 8-9

after inside tank, when lights on can go to ph6.8 -7.2
without lights is ph7.0 - 7.4
kh most probably is 1 .. 1st drop change color liow
these measurements taken last time when i started the tank...
without the fan... normal temp is around 27-29 degrees