Most aggression in the aquarium happens over an area. Many species swim wherever they want and are fancy-free.Betta fishes go where the current takes them; but others like to stake a claim to a certain area and call it home. Their territory provides a safe place to rest, hide or breed. The spot they claim may be the area surrounding a piece of driftwood or a corner of the aquarium. It might be a cave or large rock or an overhang of floating aquatic plants. Whatever spot Betta fish choose, the betta will allow some others to enter that area and punish others for coming too close.
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