Good, just the camera playing tricks with color.
RO will of course require you to add GH Booster to prevent the CO2 from causing a pH crash, and which adds calcium and magnesium that plants need. I wouldn't try it just yet, as too many changes at once can complicate the situation. Unless you know for sure there's an issue with your tapwater. A post in the PA-specific area should yield others' experiences with the same water.