This is MAYBE a Lithochromis rubripinnis (Blue pseudonigricans)

The dominant coloration is very dark blue, almost black below

In a less dominant mood, the blue lightens and the stripes appear

Below are the many colors of the dominant male:

A holding female is shown below:

Below are some pictures of juvenile males:

I have some serious doubts about the identification of this fish and am researching the ID at the moment.