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If they are the same kind of fish and it's always the same fish that's doing the chasing, then your fish are different genders. The male fish is the aggressor.

It's usually not a problem, but if the male fish is way larger it can nip off the other fish's fins after a few months bit by bit.

If you notice that the chased fish's fins are a bit tattered or broken, separate the fish from each other or add another female fish.

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12y ago
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14y ago

There could be several reasons for this. The most likely is aggression, where the one fish is trying to defend his territory. the second, less likely, reason is that they are ready to mate (if the fish re the same species), many fish do this during courtship

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15y ago

to eat it...

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Q: Why are your fish and chasing each other?
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