Hi, I have a betta fish. 
Those fish are great! They're small so you don't need a big aquarium and they have such beautiful colors!
I agree, they also dont need much food so they are low maintenance (unlike my wife).
Ha! Bettas are also known as Siamese fighting fish! Hopefully also unlike your wife!!
Siamese fighting fish? Can you tell me more about this? 
These fish are extremely territorial! They have extremely high levels of aggression toward each other. That's why they're always kept alone in their bowls.