Hi! So my betta fish’s tail and fins have been ripping and look torn up, I don’t know if he has fin rot, is stressed and tore them himself, or if the decorations he has is too sharp. He was in a 2.5 when his fins first started to tear, but now he is in a 5.5 gallon tank. I would like help on what to do and what is causing his beautiful fins and tail to be to ruined. Thank you! The first picture is how he is now versus how he once was. He’s always been a mellow betta, he swims around still and still has an appetite.