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Why do beta fish chew on their tails?

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Why do beta fish chew on their tails?
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I believe they are actually cleaning them, not chewing on them. Their long wrinkly fins collect extra slimey bacteria over time. Very nice fish, I must say.
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others may chew another fishes tail because they are known as chinese fighting fish. or, you could listen to the person above me, and say they are cleaning their tails.
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Well I think that it depends if you have two that are in a bowl or if there is only one. If two: Betas are known to be aggressive fish(fighting fish)fighting for territory. If one:thats a good question I've never seen them do that before and my husband practically has a collection of them at home. Good Luck.
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