I like the bangaii cardinals too, they're not super hardy though just to let you know. I had some and had to get rid of them because of my butterflys. They would pick on them so bad and cause them not eating at all and hiding behide things to get away from the butterflys. Between the butterflys and the cardinals, we chose to keep the butterflys. My partner always wanted those things, not me though, they're mean!!! They're Heniochus Butterfly, we have 3 of those fish. They're very fun to watch though I do have to say that much, but they're not reef safe, well...they need to be moderated anyway with reef. :happyfish