CPR Aquatic In-Tank Refugium, Pro Small (CITRPROSM) The CITRPROSM also functions as a culturing area for small organisms that are intended to be provided as a food source for the inhabitants of the main portion of the tank The CITRPROSM does NOT include a circulation pump. If you have ample circulation in your tank, you will not need a circulation pump. 7-3/8" Wide X 7-1/4" Tall X 4" Deep Includes a sliding bracket that holds the Refugium on the edge of the tank