That would be sweet! to see a steady stream of CB Ascension fish. Though I am not sure any Prognathodes have ever spawned in captivity. So little research has been done on their behavior or mating. Some anecdotal experiences I read, of P. aya suggest that they may only form pairs to spawn. There is so much diversity in the mating behaviors of the Chaetodontidae family.
I really under appreciated the family until my SO bought me my Burgess, its a fascinating family. It would be so hard to decide between the Roaops, vs Prognathodes, for subgroups of the butterflyfish. Chelmon is so over rated.