Abstract: The invention comprises a lighting arrangement and an aquarium. The lighting arrangement has a light source, a light conducting conduit, a first part positioning means engageable to, or engaged with, the light source, and a second part positioning means engageable or engaged with the light conducting conduit. The light source and one end of the light conducting conduit can be placed in a position such that the light conducting conduit and the light source are mounted on opposite sides of a sheet of light conducting material so that the light conducting conduit conducts light from the light source. The lighting arrangement can be used to provide decoration within an aquarium.