I've had the same 5 goldfish for around 7 years now. Recently one of my fish has started to become slightly swollen in the abdomen area. It seems that the swollen area is a dark colour under the scales.
I lost one fish not to long ago to a very similar problem. At first I thought it could be old age but now I'm wondering if it's a disease. Is there anything I can do to fix my fish? Should I separate it from the other fish in case it's contagious?
My sick fish is showing no other visible signs of being unhealthy.
Please help!!!
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