I had an adult pair a year ago, and it seemed impossible, they could not be kept together.
I picked up the 12 beani I have now as juvies back in Feb this year, seems 3 pairs have formed so far. This is the 1st pair to spawn.
I've almost always found, starting with 6 or more young cichlids is the easiest and most sure way to get 1 or more compatible pairs.