The top one is an OB peacock, an Aulonocara hybrid.
Second is a male Melanochromis auratus transitioning from juvie to male colors.
Third looks like a deformed Nimbochromis venustus. The head is way off normal with the hump and shortened snout. I would suspect it was either a birth defect or serious damage caused when the fish was young and still developing.
Fourth appears to be a Pseudotropheus cyaneorhabdos, sold as an electric blue johanni or maingano cichlid.
Last is a jewel cichlid, Hemichromis sp. Never been a big fan of 'em so never have learned to differentiate between the different varieties.
WYite