Hi, I just got in some goldfish. I'm not sure what exactly they are, I've phoned EVERYWHERE about this. These fish have got the head like your lionhead but the single tail of a commet. They have a long wavy tail but its definately a single tail. I work in a pet shop specialising in fish but I have never seen something like this before. I know that it is hard/impossible to keep lionheads together because of the commets aggressivness. Is it possible that they could have been kept together before and interbread? These fish are between 20 and 25 cm and are spawning as we speak.
