I as well own a betta. I feed him four pellets of betta food twice a day. The tank does not have a filter, so I change the water in his tank about once a week. The tank is also smaller than 5 gallons (I'm not too sure exactly how big it is.) I keep gravel and plants in there for him and the tank also came with a light which I keep on during the day and turn off at night. I've read that bettas like around room temperature water; it is not too good for them if the water is freezing cold or boiling hot.

I've had him for maybe two months or so. Not long, I know, but longer then any goldfish I've ever had. They're easy to care for and not to mention very pretty!