Oranda Under Attack?
I have had an Oranda in my tank for one week now, with 4 other standard goldfish and 4 guppies. At first the guppies were picking on the Oranda so I removed the guppies and after a while returned them and everything was alright. To my horror, I turned on the light this morning to feed them when I noticed that the oranda’s back was red raw with a small chunk missing from his back, I assumed the other fish had been picking on him and removed him and isolated him into another tank. I am unsure as to whether he has a disease or whether the other fish have been picking on him.