The first one is a kenyi (Metriaclima lombardoi). The second one, in my opinion, appears to be one of the red-topped zebras (such as M. greshakei), though I didn't get a good look at the tail. You're correct on the third one (yellow lab). The fourth one is Melanochromis auratus. The last one, I'm not sure... it has a Copadichromis borleyi pattern in the juvies I've been seeing at the stores, but I'm not in any way confident in that ID.