Here's the issue, if I went that big, I really think I would just order glass and do a custom build because I would want to go even bigger. I want sharks :) I think I would be targeting 300 gal as a minimum for my predator tank. Hard to say though, if I had the money I might go for Biff's setup because it's priced right and it's nice. I know I could find plenty of awesome things to do with an extra 240 :) I think the only keeping me from lining the walls of my house with more tanks is the almighty dollar.