If you properly acclimate fish into your QT; does SG of 1.020 or 1.025 really matter with fish? Not in my opinion, but maybe I'm missing something.
It only matters because I prefer to set my QT at the incoming salinity and ajusting salinity to my DT or use Hypo ( if needed) over several days, as opposed to drip aclimating a fish for salinity.