Aquarium dividing device, has objects that float at shady region surface and article that separates shady region surface from bright region surface, where less number of objects float at bright region surface

摘要

The device has an uniform lighting i.e. fluorescent tube, provided in a shady region (1) and a bright region (2). An article (6) separates a surface (4) of the shady region from a surface (5) of the bright region. A gap (7) connects the shady region and bright region surfaces. An object (9) i.e. filter, produces a water flow (8) with a component perpendicular to the gap and parallel to the surfaces from the bright region surface towards the shady region surface. Objects (3) i.e. duckweeds, float at a shady region surface, where less number of objects float at the bright region surface.