I have had Betta's for years. Just love them...they are like fish-dogs. They watch me out of their tanks and swim around keeping me in view until they get fed in the mornings. They are very happy in a decent sized tank and their care is also easy. Mine are in 2 gallon sized clear ginger jars (actuallyl their tanks are lamp bases). I read an article once about an experiment done wtih male Bettas. They put them in a lake where they were free to swim away from each other, but the two males stayed in about 24" area and fought to the death. They are wayyyyy territorial...so...they are very happy just living in their small spaces.