Jeez, I wouldn't subject my betta to that. There's nothing wrong with keeping a betta in a filtered tank. Even if they don't breathe dissolved oxygen, there's no reason to keep them in a nitrogen soup. Also, with no decor, the fish has nowhere to hide and may get stressed. Keeping fish in a bare tank is kind of cruel.
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current setup:
5.5 gallon low-light planted tank
-1 dwarf puffer named Beep.
for reference: my name is Julie 
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