The Amethyst Anthias is a medium-sized Pseudanthias species. It looks very similar to the more well known P. tuka. Females are most easily distinquisted, because tuka females are purple with yellow and pascalus females all purple. Males are variable so this makes determination a bit more difficult, but pascalus males don't posess a dorsal fin spot, which tuka males do.
Like all anthias, it's an active fish, which is best kept in a group/school of at least 4-6 fishes. When buying a school you don't need to worry about sex ratios because these fish are hermaphroditic. This means the most dominant fish will automatically turn into the male when there is no other male around.
Keeping this fish in larger numbers will definetely make it shine. Do make sure they can eat multiple times a day though, because in nature they feed on zooplankton the entire day, and are not build for one meal a day!