I have attached a picture of a koi in my pond that has had ulcers (I think) since last spring - so about a year. It is hard to see from the picture, but the skin is red in several areas and some look very raw showing blood red marks. The water quality is good and I have about 8 other fish in the pond that have not had any problems. Last year I had given the fish a salt bath (before I heard all the negatives about giving a salt bath) and its skin improved substantially. The raw spots went away and the red reduced. Now it seems to be as bad as it ever was so I am looking for help on how to treat it.
Any help is appreciated.
Thanks,
Art
Any help is appreciated.
Thanks,
Art