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There are a few reasons. They could be a pair and mating. They could just be playing. If the one doing the chasing is biting the fins or tail of the other fish, it could be a bully. If the one being chased has no signs of being bitten and is in good health, you have nothing to worry about. If you have a bully, you need to make sure he isn't damaging the other fish. If he is doing damage, he will need to be taken out of the tank.

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17y ago

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