I haven't add anything in to the water but the readings in the acuarium a
Temp.= 29 °C (about 84 °F)
pH =7.0 (came down after I put the DIY CO2)
KH=3.6 dH°
KH (ppm)=60
CO2 = 6.36 (an excel worksheet calculates the amount of CO2)
GH(ppm)=240
GH= 24. fH°

and I tested my tap water and I was pH is 7.6, KH = 50 ppm and GH=100 ppm
(about 5.6 dH) still high but is a lot lower then my tap water, could it be
the gravel and the Flourite that makes ir HARD !! ?????????????? is another
way to make the GH lower, ????