My current stock is:
6 Cherry barbs,
10 Harlequin Rasboras,
21 Tiger Barbs,
6 Otocinclus,
5 Kuhli Loaches,
1 Rainbow shark,
and the severum.
With my Kuhlis and my live plants, I don't think adding salt would be the best idea. I know to slowly raise the temperature so it doesn't shock the fish...