Adding Salt in Fresh Water Tank

[peacockbetta]

I've read that adding alittle salt into my fresh water tank will benefit my fishes, but I've also read that some plants can't handle salt. I have a small bunch of cabomba and a few of this other plant that I can't remember the name. It's grass-like with tall, stiff leaves (bi-colored: green with light green/yellow verticle parrallel band) and has a ugly root that the shrimps love to clean up.

Does anybody have any ideas if they can handled 1/2 a tablespoons of salt when I change the water this week?