Rather than mixing continents on the tank floor, where fish body language differs, have you thought about adding another African dwarf cichlid pair instead?
My hunch is that having two different species pairs on the bottom with one being Kribs will need you to create a well planned furniture/plant layout, that puts just one breeding size cave in opposite diagonal corners (with a single fish size cave in the other corners, in case either pair has a temporary tiff), and a well defined territory marker between the two breeding caves to give a line of sight barrier.