Worth running RO system?

[mpast]

My tap water is actually not too bad. Out of the tap I get;
TDS 60
GH 3
KH 3
PH ~ 8

In my tank for whatever reason, the water chemistry changes a bit
TDS 140-180
GH 6
KH 5-6
PH ~7.6 ( 6.6 during CO2)

Im wondering if its even worth me setting up an RODI system and remineralizing. Would be nice to lower my PH a bit since my livestock is going to be fish that prefer to be in that slightly acidic range. Thoughts?

 

[bazz]

Hi,
If the GH and KH values are rising in your tank it's highly likely you have some calcareous hardscape or substrate.
I don't know if I personally would bother using RO and remineralising just to lower the pH a little, especially if aforementioned hardscape is leaching CaCO3 into the water column (the pH would rise back up again), but obviously the choice is yours.
Cheers!