While your betta fish thrives on natural light, during which he can experience night and day, it is important that your aquarium is out of direct sunlight, as this can cause a bloom in algae growth as well as upset the delicate temperature balance of their tank water. The tank also needs to be near to an electrical socket for plugging in their tank heater but avoid any air conditioning or heating units. Especially if you have cats or other pets, make sure the tank is clearly off the floor and placed on a stable surface where it cannot be hit or knocked, by a door for example. And fit their tank lid securely, so your high-jumping bettas cannot escape.\r