the kribs and GBRs may eat the shrimp and GBR's need some pretty hard to achieve water parameters. Bolivians are a better choice. Also dwarf gouramis are more peaceful but still may be aggressive to each other.
The standard is jsuta group of schooling fish (tetras, danios, etc) a bottom feeder like cories or a dwarf pleco would work for you.. and then some centerpiece fish like dwarf cichlids of gouramis...