i thought you got it working after you hooked it up last time..is it still making noise????? have you contacted the seller???? here are some links to the octo skimmers... i bought mine from marine solutions.
http://www.customaquatic.com/customaquatic/subsubcategorypage.asp?subcatindexID=ps-std-md
http://www.aquacave.com/searchresult.aspx?CategoryID=222
http://www.marinesolutionsinc.com/catalog/index.php?cPath=22_35
http://thereefshop.com.au/index.php?main_page=index&cPath=1&zenid=8aa7a080fb10523012634708004bf473
http://www.customaquatic.com/customaquatic/subsubcategorypage.asp?subcatindexID=ps-std-md
http://www.aquacave.com/searchresult.aspx?CategoryID=222
http://www.marinesolutionsinc.com/catalog/index.php?cPath=22_35
http://thereefshop.com.au/index.php?main_page=index&cPath=1&zenid=8aa7a080fb10523012634708004bf473