You are missing your bio-wheel. And you are missing the media tray. The bio-wheel goes infront of the spray bar. And you can get a new one at any major lfs. The media tray is a gray plastic 2-peice tray that goes inthe second slot behind the blue filter. Most people use it to hold more bio media like bio-max,etc,. You can get another one of them off of ebay or do a general search for emperor 280 replacment parts.-------------------------Make sure it works before going thru all of this