Hi I have one oranda goldfish,scully, in a 37 gal and she's usually so fast moving and energetic bt recently she just sits at the top of the tank and floats. If i come and disturb her she'll move around for a few seconds and then go right back, so I don't think its swim bladder. Last weekend I had a black moor named mulder in there with her but he died from swim bladder. I found him just bobbing at the top unable to move so I tried to feed him a pea but he wouldn't take it. I then decided to fast him for 3 days but he didn't last that long. I'm scared something has happened to my current fish scully. Why is she doing that?