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Sometimes Betta just do not adapt to larger tanks. I've had at least three that, all things being equal, only calmed down and stopped biting when I put them back into a 2.5. They were stressed in a five, eight, 10 and 20 long. So it's quite possible that's your female's problem.
One thing you can try is to place another divider in the tank so she has around 2.5 gallons. If she calms down then you will know that is the issue. If she doesn't then you have eliminated one cause and have other options to explore.
Good luck!
One thing you can try is to place another divider in the tank so she has around 2.5 gallons. If she calms down then you will know that is the issue. If she doesn't then you have eliminated one cause and have other options to explore.
Good luck!
