I have a Tunze 9415 which is a beast of a skimmer. I have been using it on my 180 gal for the last 3 years and it is the most stable skimmer I have ever owned, never overflowing even once and skimming within minutes of cleaning. I think it is oversized and could easily be used on a larger tank. Due to a silly error on my part, I had to replace the pump this spring, so the pump is only a few months old. I am in St. Louis but am willing to ship; I have the original packaging. $400