I have female bettas (20g long) and they're not at all bored by their environment or aggressive. But, frankly, the male (in 75g) is utterly bored. He travels, snoozes and investigates in a lazy manner. Frankly though, he looks incredibly bored. The only time I see animation from him is when I wave at him and run my fingers on the glass. I understand female bettas (horribly misunderstood), but I don't get bored male bettas. Female bettas don't get bored. Males do!