These fish have not yet been bred in captivity without the use of hormone stimulants so it is highly unlikely they will breed. They are also highly territorial towards each other and unless the tank is very large two will most likely fight till one is dead or removed.
I agree, they will probably kill each other before they think of making love. They are too terotorial to be kept together, i'm sure it is posible if you have a tropical pond with a thousand or so gallons, but this is unlikely.