In this one, I have three males and one female. Normally, it's best to have things the other way around, as males can become quite territorial. This tank, however, is 70 gallons so there are places each male can go where they can not be seen by the others.
The oldest in this tank is John McFish. He is a silver angel around four years old. His mate, Christy McFish, was a smoky leopard who passed away some time ago.
The two koi angelfish are from the same brood. However, although one is male and one is female, they have never been interested in one another romantically - which might be a good thing, since they are brother and sister.
The female koi is interested in the blue marble angel, which is about the same age - around two years old. He is the alpha male in the tank, which might be why she is so interested in him. It is important for the male to be able to protect the eggs and fry from predators.
All of the angelfish get along just fine with the other fish in their tank.