Melanochromis auratus - what a fish! The very first mbuna I bought about a hundered years ago! Bought them as juveniles, knew nothing about them, thought they were getting sick when some of them started getting this black coloration! Wow! Did I ever have fun with those guys! Great time for me learning about mouth brooders. As I'm thinking about it now, they could have been W/C back then. It was actually 30+ years ago.
This is the species that has me determined to get another tank full of mbunas, with Jim Beck's help, although I may not get auratus this time though. Might be a little too feisty for the group I put together.