Lid Or Hood Tanks are sold with a lid different from the light, or the lid and light-weight could be joined into 1 device called the "hood." The lid part addresses the tank and serves to prevent fish from jumping out from the tank. For reference, the volcano is regarding https://aquariumtankrental.wordpress.com/2023/12/17/3-must-have-things-while-building-an-aquarium/