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I agree, a photo would be of great help if you can get one.
Once in a while they can get caught on something in the tank and injure themselves, but it could be many other things too.
If at all possible, you may want to put it in it's own tank so it doesn't have to compete with the other fish or if it's possibly an illness, it won't be as apt to spread it to the other fish.
Once in a while they can get caught on something in the tank and injure themselves, but it could be many other things too.
If at all possible, you may want to put it in it's own tank so it doesn't have to compete with the other fish or if it's possibly an illness, it won't be as apt to spread it to the other fish.