This question would require pages of answer, and because the term "bleekei" is not considered valid by the scientific community, very difficult to give a quick answer to.
One of the best resources is the book,
"The Endemic Cichlids of Madagascar", by de Rham and Nourisatt
I have had it since it was translated into English and reference it to check any answers I might give here on MFK. I believe it is a must have, for any serious keeper of Madagascan cichlids
If you want to get into naming specifics, there is an article called "How many Marakely "(1993) by Loiselle and Stiassny that breaks down the variants step by step.
Marakely is the Madagascan name for Paratilapia, and the authors are 2 of the best known and respected scientists working with cichlids today.