I have adopted a female bristlenose with a white patches at the base of her tail and on one side. I won a small tank set up on trademe and the fish was available (if wanted). When I picked up the tank, it was in a bad state. Gravel full of crap, 2 stalks of plant in an otherwise bare tank, a submersible filter with a foam pad that was disintergrating and jammed with crap. Oh and with the lighthood on it, no place for the poor fish to hide. The smell in the tank was not pleasant.
Anyway after cleaning up the setup, replacing foam pads, providing some driftwood and good feeding, shes looking better after a week. the hhite patches are slowly going away. Next I will try and find a friend for her.