My research concludes that there are only three species in that tank that NEED salt... the seemani catfish, the mono, and the green chromides. The rest of them are freshwater/light-brackish. Except for the Buenos Aires Tetras.... those are pure freshwater. Other than the fish I just listed, the stock is
kribs (breeding pair)
celebes rainbowfish
indian glassfish
knight goby
figure 8 puffer
indo dat
golden wonder killifish