I do 30% water changes 3 times a week. Once the water has been aged it is around PH 7.4, GH 5, KH 2. I filter it through a RO unit and carbon. Then I add prime and 100mls of geo liquid to the barrel.
When I test the tank water before changing it the PH is 6.3 will this upset the fish when I then put water in that is ph 7.4 ? Also the KH is 0 should I add something to the water ? I am worried with KH on 0 that the PH may crash?
The fish seem very healthy and eating well.