Scottyhorse
Aquarium Advice Addict
Apistos are different than alot of cichlids and can in fact be kept in large numbers. I wouldn't suggest keeping a ton in your tank but you can certainly get a away with two males and group of females.
Once they pair up, they are aggressive. They are NOT harem breeders like some people think! Each male will pick a female, and the rest of the females will be bullied to death. Then the pairs will bully each other relentlessly. If this had the footprint of a 40 breeder, then yes, you could have to pairs.