Yes, mandarin dragonets do apparently really stink to other fish. I introduced a new male mandarin dragonet today and the bicolor wrasse (who's kind of a twat sometimes) decided to head over and give him a nip. Well, that was ill-advised. He beat a hasty retreat and was not at all expecting whatever he got a mouthful of. Two of my damsels also came over to check him out but stopped abruptly and settled for spinning around and flapping their tail in the mandarin's face. The mandarin could have given two *'s and just went about hunting copepods. Fish are funny sometimes...