betta for about a year and have had no problems with him. He is in a two and a half gallon heated tank with a filter. The tank has two live plants and two fake plants. I went on vacation for 4 days and left him with my parents so they could feed him and when I go back his fins looked a little tattered. I figured he snagged them on the fake plants so I took them out. Its now two days later and they look far worse. I have done a large water change hoping that would help. Any idea what is going on and what I can do it fix it? Thank you.