They must be full grown (8-12", depending). Mine were about 7 years give or take when they first laid eggs.
They'll flare their gills at each other, and do the cichlid shimmy. They'll dig a hole and rearrange the whole tank to their liking, they really like some large flat stones to lay eggs on, but if that's not available glass will be used.
Good parents usually. They'll take care of the eggs and the fry.