I'm very sad right now. It just happened in several hours. I don't know how to treat this either. Her tail is roting and the back half of her body is an ugly brown color. Somebody please help. I really don't want her to die.
The same thing happened to me not to long ago with my old betta. There was really nothing that i could do. I would euthanize her so she doesn't suffer any further. Its sad to see.
If it literally just happened over night then it is probably saddle back and there is little hope other than kanamycin or macry1 & 2 combo immediately given.
Once it gets to the body then that is not good.