LOL knew someone would say that eventually.They are beautiful...but they will live longer and be happier and healthier if you provide them with a heater and some filtration. You can get a 2.5 G setup and a heater for under 50bucks....even better...you can get a 10G setup at walmart for 50bucks and a heater for 7. A betta will use all the tankspace you provide him with...believe me. I have one in a 55G, 29G, 10G and 5G and they all swim all over their tanks....not trying to preach, just educate![]()