Typically speaking the inlet tube of a cannister filter looks like the inlet tube of a power filter and is placed on one side of the tank. Outlet tubes vary a bit, but they are generally place on the side of the tank opposite of the inlet. Normally speaking they really aren't too noticable unless the materials are made of an unusual color. I know my fluval 404 came with grey outlets and inlets and I don't find them to be too noticable, but I have changed my inlet to a clear and black set up. Well right now its a clear and dark green because of algea set up.