Malawi cichlid ID

There are an awful lot of yellow Malawis - was there another fish with the same body shape in the tank? If there was, and if it was partly or wholly blue, it would probably be the other gender of this species - and that might make it possible to provide a name.

@gentle lemur

There were two striped blue/greyish species in the tank.

A grey species with a hump head, and a blue-ish one with a smooth head similar in shape to this one (I'll see if I can find a picture of the smooth one)

Edit:

This one shows some blue ones in the background.

This is probably a better photo, it's older but you can clearly see a smooth-headed blue cichlid at the bottom