Anthias (pseudoanthias actually) are a large group of fish, with a number of potential candidates for our tanks. Just like tangs, for example, different species come from different environments, and have differing needs. Some pseudoanthias are relatively easy to feed, others not. Some need lots of swimming room, others not. Some exhibit high levels of intra-species aggression, others do not. As a general rule, they need frequent feedings, plenty of space and avoiding more than a single male. But even thoses vary by species. Most commonly, and most easily, kept species include Bartlett, Lyretail, dispar.... a few others.
I've currently got a bunch in my 265. Five Bimaculatus that eat pretty much anything, but are big and boisterous. Three bartletts, same as bimacs. Five resplendents, also eat most thing; much smaller and shoal together. Started with seven, but two found their way through my screen top.

. Two princess; very picky and having a hard time keeping them at a healthy weight.