I'm running 1.010 to 1.011, for the Mono sebae, Guppies and Mollies. The guppies are getting chewed on a bit and I may give them a "skybox" in my brackish tank.
But most hardy brackish fish like mine should tolerate a range of densities, and can adjust fast to small changes.
If you go on vacation and the density goes up some they won't care like a coral tank.
Just add fresh water to bring it to your normal density and do a change if desired.
(Mono sebae eventually become full salt, and mine will as well.)