If they have a 40% mortality rate it kind of begs the question should these fish even be available for public purchase? Seems kinda selfish of myself and other reefers to be subjecting anthias to the home aquariumYour experience isn’t too far off for SE Asian squampinnis anthias - they commonly show a 40% mortality rate over the first 40 days. If you can get them from East Africa or Sri Lanka, that rate is lower.
Jay