If you were keeping rift lake species, you "might" think you needed the extra mineral salts created to mimic the lakes mineral composition.
But salt, (NaCl) is salt. So when I need salt is use plain old water softener salt, or just plain old rock salt. That's when I needed salt to medicate.
I have kept many of the Vieja species, and most have spawned for me, and never added any salt as part of normal routine. My tap water pH is 7.5-8.00. alkalinity 100ppm, and general hardness @ 250ppm
That said, if your tap water is soft and devoid of minerals, a little rock salt wouldn't hurt.
You may want to check the parameters listed in your city water quality report.
google your cities annual drinking water quality report.