What's up with my koi swordtail?

[yonsu]

So, I brought home a koi (albino) swordtail this evening. I was told that he or she is a male, but I am not so sure. I am also curious as to whether he or she is deformed. His/her tailfin just does not look right to me, like it should be a little bigger, rather than curving up at the bottom. Some input, please?

http://img240.imageshack.us/img240/8568/koi1yr.th.jpg (http://img240.imageshack.us/my.php?image=koi1yr.jpg)