one can live in a 55 not ideal but it can... can breed in a 55 if they get along with each other....that's about it. currently trying to grow a KML in a 55 to see how he develops. if he gets uncomfortably big for it ill move him. if he is noticeably stunted i will feel like S**t
kinda small, if you add a divider you may have a male in it otherwise one of them will end up dead. But if you go look in asian aquarium most flowerhorns are stunt.