curled pelvic fins

I got my crown tail male in December. Ever since I got him, the tips of his fins have been curling a bit, but they seem to be more so now, including his pelvic fins which were less curled before. (sorry for the blurry photos, he wouldn't hold still) I don't think it's fin rot or biting since...

This is my mom's fish, Elon. He's had these super curly ventral fins as long as we've had him. Is that just the way he is or could it be because of some sort of problem? Thanks for any/all help!