Can anyone help please? One of my aquarium goldfish each morning is found in a 'u' shape at the top of the tank. After feeding the fish with daphnia and peas, it eventually swims normally, but then returns to a 'u' shape overnight. Has anyone any idea why this is happening? Could it be swim bladder disease or something else?
The aquarium is 20gallons capacity and I have two seven inch goldfish and one small fantail. I am hoping to transfer the two large goldfish to my pond in the Spring.