Chuck Gadd wrote ...
but you will need to deal with the topping off
the water level more often.

And with the fact that salts and other stuff ("stuff" = heavy metals,
organic and inorganic compounds, etc.) will have an increased tendency to
concentrate in solution. You probably want to increase your water change
routine somewhat and be certain to be siphoning from the bottom of the tank
where the heavier water will settle.

kush

"You can't have everything - where would you put it?"