04-22-2011, 03:22 AM
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I agree with both responses. Tetras are schooling fish, and bettas are at least semi-aggressive, sometimes more than "semi" aggressive. I was wondering if the fish she has shared with before was in the tank before she was? If so, the other fish had the "home field advantage," so to speak. This time the betta does, and she apparently doesn't want to share.
On another website's list of fish who are compatible tankmates for bettas, it says that female bettas are more likely than male bettas to attack neon tetras. Maybe this is true with other types of tetras, also.
Edit: Although this is probably unrelated to why your betta attacked the new fish, it is something to think about. By putting a "brand new" fish in with your betta, you have exposed her to any bacteria, fungus, virus, or parasites that the tetra might have. New fish really should be quarantined before putting them in with other fish. Since the tetra is now in quarantine anyway, I'd keep it separate from other fish not only until it heals, but until you know for sure that the tetra is healthy. Then to keep it healthy, it really needs to be with others of it's kind.
Last edited by Amethyst123; 04-22-2011 at 03:28 AM..