My medium sized ryukin goldfish has been floating upside down now for just over a week and a half, ive been feeding him only peeled peas for last two days to try and flip him right side up but it has not worked. Then just yesterday he started to have a red blood-like area show up on one of his bottom fins and it seems to be getting larger. It looks pretty bad and I fear that whatever it is might kill him. I need to get hime rightside up and clear this red area but i have no idea what it is or how to treat it. The levels of my tank are all at 0, besdies nitrates which is just a little above normal but i try to keep this under control with water changes. The tank is 45 gallons and has been established for almost a year now. water temp is at 67F. There are are two other small goldsfish in the same tank that are completely fine.