I purchased this unit a little over a year ago & it is in good condition with no dings or saltcreep. It will come with a air pump & a piece of Neoprene hose. This unit is adjustable between 0-300mg. I was using this on a 180G tank & only had to turn it up a little bit so i know it will handle a larger tank if needed. Asking $165. Here is a link: http://www.cleanwaterstore.com/OS000...one-ozone.html