The light one pictured might be a Labeotropheus fuelleborni. These look a lot like L. Trewavasae, in fact, off the top of my head, I don't know the difference. They both have thick upper lips which allow them to harvest algae off rocks better in the wild. They also both tend to get kind of big bodied for a Mbuna. They are nice fish.
The reason I think it's a fuelleborni, is because I can't recall ever seeing a Trewavasae that blue.. Check out this pict.. it looks a lot like yours.. look at the smaller picture, second from the top, light blue fish http://www.malawicichlids.com/mw09000g.htm
The reason I think it's a fuelleborni, is because I can't recall ever seeing a Trewavasae that blue.. Check out this pict.. it looks a lot like yours.. look at the smaller picture, second from the top, light blue fish http://www.malawicichlids.com/mw09000g.htm