Some common signs of bacterial infections are that the fish may appear sluggish, it may hide and not eat. It might have a swollen body red streaks or spots on it's body. The infected fish might have eyes that are cloudy or protruding. It might also have torn or frayed fins. If a fish is showing any of these signs then there is a good chance it is infected with a bacterial disease.
Dropsy: The fish will have a swollen body with raised scales making it look like a pine-cone. If caught early it can be treated with Maracyn-Two or Furan-2.
Fin Rot: The fish will have frayed and damaged fins. It can be treated with Maracyn-Two, Furan-2 or E.M. Erythromycin.
Mouth Fungus: The fish will have white growths around the mouth. It can be treated with Furan-2 or E.M. Erythromycin.
Hemorrhagic Septicemia: The fish will have red spots or streaks on it body and fins. It can be treated with Furan-2 or E.M. Erythromycin.
Hole-in-the-head: The fish will have ulcers that look like holes in the head region. It can be treated with Furan-2.

