These fish were given to me by a friend that was taking down his tank. I searched all over and can't find anything. The bigger one is a male smaller female.
Conditions permitting you may want to add more to alleviate any con specific aggression. I have 3 and think 5 would be more ideal. That said, they only loosely school so unless you have a large tank or tankmates they may act closer to a normal cichlid than a schooling fish.