I found the thing I was originally looking for, because I had one in the FW tank and just used it one day connected to my large outside magnet in the reef. It was AWESOME. I went looking everywhere for it, including online, but now somehow it popped up again, so I am going to try it once more. I'll let you know how well it works this time.
http://www.aquatichouse.com/Maintena...MagScraper.asp