The myth about Betta fish is that they live in puddles, but the fact is they live in rice paddies, that are long and shallow. They are also tropical and need warm water at an absolute minimum of 76 - though many will say 78. They are kept in those tiny cups because it easy for breeders to keep many at a time. A spawn can include hundreds of fry at a time. And it's a selling tactic to make you think that Betta fish are low maintenance, but they really aren't. I had a pet store employee tell me that the average life span of a Betta was 6-8 months and that's why they make good pets for little kids, but really it should be 2-4 years.