I heard from a person online when asking about my betta's fin issues that
"3 gallons is normally not a comfortable size for those fish however, they're rather tolerant of small enclosure. Ideal size would be 20 gal long, their territory can expand upward to mile in wilderness. There was a previous experiment conducted in one of freshwater lake in USA which they dropped 2 male bettas at each end, approx. 5 miles away and they found each other next day- one died after fight but conceptually you would know their range."
O.O Has anyone else heard of this?