Lots of fish, just thought I would mention a lot of those fish aren't mbuna.
Looks like they took say an otter exhibit and just stuffed it full of Malawis. (Just saw the alligator or croc.)
I always wonder if I would try a huge tank someday stuffed with them, but I would sort of really like to put some females in there and well you would have a hard time keeping them from breeding hybrids.