Rescued a female betta yesterday that was a bad bite wound on her back. Was an open wound last night and today it has a cap of white on it. I've never had a fish with such a bad injury before, so I'm not sure if this is the start of infection or a scab. So far she's had one dose of paraguard. She's in a 5 gallon hospital tank with a filter and heater. A water change was done on it yesterday before she was placed in it and treated with prime. The first 3 photots are from today and the last photo is from yesterday.