The Eclipse Systems seem like they would be great! The six gallon tank would just fit on my shelves (granted my shelves could hold the weight of six gallons, I'll have to see). The twelve gallon could fit on top of my dresser, but it looks pretty expensive. I'll end up with the tank but won't be able to afford a Betta. XD
Would the filters in these tanks be a problem? I know Bettas don't really like the currents...
This may seem like a stupid question, but if you have a tank with the filter, how often would you have to change the water? Whether it be a partial change or a total change? I guess it'll probably depend on the size.
Thanks again for the help, everyone. You've all been so helpful!