my golden domino, about phone-sized and beefy, is digging a nest like crazy, (uses her tail), buzzing (they do, loudly enough to hear in another room: sounds like a tank pump is up against the glass), and the only POSSIBLE mate for Miss Titanic is a modest-sized three-stripe. They're both dascyllus, but I somehow think nature did not design these genes to cross. The little blue damsels are staying out of their way.