Dividers are often marketed as a way to keep multiple bettas in one tank, 😬 but they can actually cause more harm than good. Bettas are territorial fish, and even if a divider separates them, they can still see each other. Constantly seeing another male betta can lead to chronic stress, aggression, and fin damage from flaring too much. That stress weakens their immune system and can cause illnesses like fin rot or lethargy over time. Dividers also limit swimming space and can restrict water flo