All of the Aqualog books are excellent value, although they are not particularly cheap. They are full to the brim with first class colour photographs and to reproduce these in a book is an expensive process. Whether they are about African Cichlids or some other species of fish they are the most comprehensive identification books you can buy. They never become dated because as new fish become available to the aquarist trade the books are updated. There is not a lot of literature on African cichlids so this book is invaluable.
They do not deal with the basics of fish keeping, there are many and varied books that do that. They are in the main a fish identification encyclopaedia and nothing more. But for those aquarists who are particularly interested in a single species they are indispensable.