Added some Anubias plants yesterday which I think complete the set-up. They seem to like the huge centrepiece Anubias.
male:
male (very hard to get decent side profile shots of these guys):
female in front - you can clearly see the black in the dorsal:
male:
male (very hard to get decent side profile shots of these guys):
female in front - you can clearly see the black in the dorsal: