Viewing your corals and clams from the top of the tank is usually impossible. This allows you to view and or take pictures of your coral without the disortion of the surface of the water.
6 in Dia x 3 in H
Black cylinder ...
6" Coral Viewer / Top Down Box
Surface agitation in most reef aquariums will cause the view from above the aquarium to be distorted. Using the Coral Viewer allows you to view the inhabitants of your aquarium without distortion....