I love Bettas, and have had several. They need at least a five gallon tank, heater, and filter. A varied diet is important as they are prone to constipation and Swim Bladder disorder.They don't like a lot of current ...Bettas will kill each other if tanked together. Males must be kept alone, but females can manage if kept in proper numbers and tank size. The male is much more personable than the female....