The big draw for freshwater tanks is removal of nitrate, plants are the only reason you would want nitrate in a tank that I know of.
Temps-I was referring to temp of lighting. I imagine 6500-6700 grows algae best, so if you have temps at extremes your fish might look better but algae wouldn't grow as well. In planted tanks well we often create algae factories
OOOOh, Kelvin temps! I get it.