I think it’s best done getting all small juveniles (likely all female) or 1 bigger and 2 smaller. For forming pairs and trios this is why I’ll only buy captive bred angels. Angels are pretty much all protogynous hermaphrodites capable of sex change and so far the most reliable method I’ve seen, as demonstrated by OrionN and some others, is either one of the two methods given ample room and hiding spaces. Some have also demonstrated that a pair can become a trio without too much difficulty when a smaller female is introduced and quickly accepted.
Some dwarf angels form only harems, some form both pairs and harems depending how how readily available conspecifics are. This is in the wild although I have seen harem forming species (like Coral Beauties and Flames) do fine in just pairs.
But it is my belief that Centropyge / Paracentropyge would prefer harems over pairs whenever possible. IMO I would only try to form a trio in a 6’+ tank, and most tanks cannot hold anything more than a trio due to the females needing their territories.
@alton
@OrionN
@ca1ore