I have a common goldfish that lives in a 20 gallon tank by herself with a filter and heater. Recently she has been showing signs of swim bladder disease because she wouldn’t swim properly. After feeding her peas, she would perk up right away. The past couple of days she has been very slow and not as responsive as she usually is.
However, right now she is laying at the bottom of the tank and her body is arched in a 'U' shape, she is barely responsive and not moving. Usually when she does this, I feed her peas and she tries to swim around to eat and eventually goes back to her normal self. This time, she doesn’t seem interested. I don’t know what to do or how to treat her because I don’t even know if this issue is still swim bladder disease.
Please someone help, any suggestions would be appreciated.