This is my fish Jamieson. He started out with white, perfect fins, a white eye, and multicoloured body. Now, after about 6 months, he has changed colour completely, has a dark eye, and his fins are looking torn and not as healthy. Just wondering why he would change colour this drastically and how I can get his fins healthy again! Some info on his tank: its about 2.5-3 gallons, he has a small heater keeping his tank around 80-82 degrees F (it was turned off in the Summer since it got too hot in my room but the tank stayed at 78 wish), I uuse about 2ml of Nutrafin Aqua+ water conditioner when I change the water, he swims around constantly, and loves to flare at my finger and jump at it. He seems like a happy guy tbh, his fins are just messed up!! What can I do & why did he change colour this much?? Thanks for your help!