Don't know if it would help but you might add a bubbler or air stone to better oxygenate the water. Betta are facultative breathers and use their gills as the primary breathing apparatus when possible.
I was reading a study on Goldfish and increasing oxygen level is one of the suggestions. As Betta are obligate breathers and use their gills as the primary breathing apparatus when possible it might help to add an air stone or bubbler
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