I used to have a betta back when I was a kid. He lasted for seven years! He was the most beautiful fish ever and hew as in a half a gallon tank thing and he was always content. Well fast forward a decade and I want my son's first pet, a blue crown tail betta named nemo [because my son thinks anything with fins is a lost clownfish] to be safe. We got him a one gallon tank, filtered, aerated and heated. He was doing great, two weeks and a bubble nest. Well we got him a ten gallon tank just because The ten gallon was a DOLLAR more than the five gallon and I just thought it'd be a better investment. Well it was one of those sets that comes with everything you need... all I bought was the gravel and some decorations. Issue is he looks spazztic. He's swimming really fast, I feel that maybe the circulation in the tank might be too much for him and I have no idea if I'm just being a paranoid tank mommy.