Pic 2 is a Maylandia Callainos and pic 3 is a Maylandia Lombardoi. Not too sure on pic 1 as it looks like its not showing its full colouration, maybe an Elongatus.
Pic 3 is definately a sub adult male Lombardoi going through the colour change from blue to yellow. Could do with another pic of number 1 but i'm still going for Elongatus.
Pic 2 is a Maylandia Callainos and pic 3 is a Maylandia Lombardoi. Not too sure on pic 1 as it looks like its not showing its full colouration, maybe an Elongatus.
Reckon 1 maybe a mix of melanochromis species and something else.... i've only ever seen chequers like that on a johanni, but the body chape is all wrong.
you might have problems with the id on 1 i had an almost identical fish it was sold to me as a melanchromis johanni but as druchii said the shapes wrong ?