I keep my reef, Nano and Fowlr at the same salinity so there is no confusion and can switch fish around in my tanks , if the need arises without adjusting the salinity too much and spend a couple hours dripping.
I hate when I buy a fish from my Lfs they keep their salinity at 1.018 and takes 3-4 hours to bring the salinity in the new fish to 1.025.