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I'm no expert but I recently bought two bettas. Both of them had trouble swimming when I put them in bigger tanks. The first one couldn't swim down- the second one had a hard time swimming to the top for air. In both cases, I think it was because they were sitting in those tiny cups for so long their little muscles atrophied or just didn't get used enough. They were both swimming normally within a day.
Good luck! :)
 
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