imo pretty important, unless your plan to keep mainly small fish and do frequent water changes. personally as someone who has had 30+ skimmers from bubble king down to in-expensive skimmers, i am not a huge fan of reef octopus cone skimmers unless it is a recirc model, the 160 model isnt that great of a skimmer, pump is to powerful for the body size. how about letting us know tank size, how much space you have for a skimmer, height, length and width and a price range and ill try to help you out