Fishnship

Hello, does anyone know what type of tail this is? The molly fry is a couple of weeks old and it’s tail has always looked this way (was just too small and fast to take a pic or record before). It is the only one of the whole batch who is like that and I have never seen it on any other molly fry before. https://www.reddit.com/r/MollyFish/comments/l0u2ij/anyone_know_what_type_of_tail_this_is_on_a_molly/?utm_source=share&utm_medium=ios_app&utm_name=iossmf