Why do kuhli loaches swim in circles?

Kuhli loaches often swim in circles as a natural behavior related to their social interactions and exploration of their environment. This circular swimming can help them establish territory, communicate with each other, or simply engage in playful activity. Additionally, their curved bodies and unique swimming style contribute to this behavior, allowing them to navigate through their habitat effectively. Overall, it's a normal part of their behavior in both wild and aquarium settings.