HI my betta, Mimzy has a torn fin I think. The fin is still hanging on and the edges are red where i think it came off. I noticed the fin hanging this morning and changed his water before i went to work. i dont want it getting infected or anything and i was wondering if i should put aquarium salt in his tank. He is in a 2.5 gallon tank with a filter and i use either stress coat plus or prime water conditioner. i change his water once or twice a week and he is the only fish and the only plants he has are plastic. Here is a picture of the fin. Also i know he's a bit bloated but my sister fed him without soaking his pellets first.