I've always been a fish lover and my bubble-eye is one of my favourites. I have to say, it's the most beautiful bubble-eye i have ever seen. It is kept in a tank (not too sure, but atleast 50 gallons) with a few oranda and ryukin as well as a black moor. It's very adorable and has no problem feeding even with the competition.
However, recently it's been floating upside down a lot. It doesn't seem to be suffering and it still swims when upside down. It's been eating normally, too. I'm just a little worried because it flips itself upside down every few minutes and i'm not sure if theres something wrong with it or if it's ill.
Is anyone familiar with this behaviour in goldfish?

oh i see.
Okay i will try that.
thank you so much!

You could, while you have him isolated, also treat the water with some Epsom salts It works much like a laxative and relaxes the muscles of the fish Add about one eight of a teaspoon to 5 gallons of water, you can add a slight bit more if necessary.