All, I have a sick or injured platy, and I need help determining what is wrong and what I need to do to help the platy and the rest of the community if it is illness. Symptoms. Platy is chickenwinging his left fin and is not using it at all. There is off white discoloration near base of fin and on his underside I believe. He is eating well and is swimming around taken normally. My first fear was the discoloration was a fuzz but I can’t tell. I went picture happy so I’m looking for any advice. Any help is appreciated.