What is a normal fin for a betta fish?

Well there are lots of types of fins for betta fish. my betta fish has a long stringy tail and fins, but my female has short average fins. most have plain fins. mine is the only one i have seen in my area with a stringy tail. most fish have stringy tails if they are sick but not mine he was bred to be like that. depending on the fish and the area well there are lots of things that are considered normal for bettas.