I've had my betta for almost two weeks. Originally I had him in a small bowl but then I switched the bowl to a tank. The problem that occurred in both housings was that he always saw his reflection and would literally swim up and down, side to side, and aggressively chase his reflection. It's been going on for several days. He's okay at night when it's dark (obviously) but I feel like he's going to exhaust himself to death. Should I return him or just wait it out?