I do not have any males as of now showing signs of being "Rosetail" I have not culled one male yet. I don't consider "Rosetail" to be a defect I think it is a very attractive fin type. I would not want to lock in a line of Rosetail but I would not cull because of it.
It is going to be a hard choice because they all have desirable qualities. I am looking at "comb tail", "King Crown" and "Halfsun" I am going to try and improve on and lock in the "Halfsun" trait, I'll breed best male to best female and hopefully strengthen the trait.