RO/DI water for top-off
I am using tap water for my planted tank for waterchanges. When i top off every other day, i use RO/DI water from my system to not increase the minerals and salinity of the tank water. Should i condition the top off water with ro right or some other reconstituting substance or not? Right now i am just topping off about 1 cup per 2 days with regular RO/DI water which has a ph of 6.8. And my tap ph is 7.5. What would be the best?