I have had Finnick for about 9 months now and I was wondering if his tail fin shape is something I should be concerned about. It seems to have grown in an odd way where he has two sections going beyond what the rest of he tail is going. I want him to be healthy and happy, any insights on why his tail is the way that it is. He is a koi betta if that helps at all. Attached is pictures of when I first got him and very recently.