if you only feed every three days, you need to stick to the "grazers", like a tang (or a couple of the smaller tangs that dont get large)....the meat eaters will likely starve (I was going to say fairy or flasher wrasses have nice color, but likely need meaty foods daily).
definately not anthias, like cubbies said, you need to feed them multiple times a day, which is why I dont have them, I only feed daily.