Abstract: There is provided an optical sensor package including a substrate, a base layer, an optical detection region, a light source and a light blocking wall. The base layer is arranged on the substrate. The light detection region and the light source are arranged on the base layer. The light blocking wall is arranged on the base layer, and located between the light detection region and the light source to block light directly propagating from the light source to the light detection region.

Abstract: An aquarium for keeping live water animals and water plants is disclosed which includes a housing and a filter tank fastened inside the housing at one side thereof. The filter tank includes a dirty water chamber for receiving water from the housing, a filtration chamber separated from the dirty water chamber and a clean water chamber for receiving water from the filtration chamber. In one embodiment, a pipe assembly is used to guide water from the dirty water chamber to the filtration chamber or to discharge water out of the filtration chamber. The filter tank further includes a water pump for pumping water from the clean water chamber to the housing so as to induce water contained in the housing to circulate through the filtration chamber for filtration through a filter bed. In a second embodiment, the pipe assembly is replaced by a sluice controlled opening between the dirty water chamber and the filtration chamber and a drainage pipe and valve arrangement opening into the filtration chamber.