tang man is right about anthias being hermaphroditic, but they need even larger groups to avoid the male picking on the females. A group of at least six females and one male would be best, 8 females would be even better.
i've looked in the books i have "Marine FIshes" and "Marine Atlas" and did not find this Parvirostris. The closes thing that looked like it was the Pseudanthias ignitus.
anyone know of this particular one?
Scott Micheal's Reef Fishes vol. one has the most comprihensive info on Anthias I've ever seen. The ingitus is closely related to dispar and Micheal doesn't recommend them too highly. Not A good track record in captivity unless you want to feed them 3-5 times a day.
Yeah, they're supposed to be the hardiest of the anthias. You should get yourself an automatic feeder to give your fishies a little meal of flakes in between when you're not there.