Hi! Im new to this site. I own a betta. I have yet to change my bettas water. I have changed it once and have done 50/50 water changes. I know I need to change his water I am doing that today. I woke up this morning to find that my bettas bottom fins look frayed same with the side and top. He is not very active and his fins just kinda hang there. I am worried... probably more worried then I need to be. How do I fix this? medication? plzzz help!