#1 Red Zebra (Metriaclima estherae); probable female.
#2 Albino zebra of some sort (Metriaclima sp.)
#3 Melanochromis auratus (color-transitioning male)
#4 Probably a Cobalt Blue Zebra (Metriaclima callainos)
#5 Orange-blotch (OB) Zebra (Metriaclima esthae/zebra OB)
#6 Power Blue Socolofi (Pseudotropheus socolofi)
#7 'looks like' a yellow lab lacking black fin markings or a hybrid of yellow lab extract, could be something else, though.