I believe the scientific name is chromis xanthurus (xanthura). I purchased 2 and added them to my tank with 2 GSPs. Neale, I didn't mean to disrespect and go against your word but they were much prettier than the green chromis you recommended so I couldn't resist. My GSPs have always been uncharacteristically mild mannered as they lived peacefully with Fig8's before. Except in the beginning showing a little curiosity, they are now totally indifferent toward the damsels. These damsels already found couple rocky spots for home where they stand guard. They are fiesty little fish yet show no aggression toward the puffers. I just wish they don't hide as often. Sometimes they are impossbile to locate.