Fish on left is either a male peacock cichlid (Aulonocara sp) or a young male Sciaenochromis ahli. Both are reasonably peaceful, with the peacocks growing to about 4-5 inches and the ahli reaching 6 inches. They are both predators and will eat small fish and shrimp.
Fish on right looks like a Maingano Cichlid (Melanochromis cyaneorhabdos). A reasonably peaceful Mbuna type cichlid and also grows to about 4-5 inches.