Wont be adding another grouper (if ever) until I get a bigger tank. The plan is to get a 550 in two years. 72"wide X 33" deep X 54" tall. Kind of wierd dimensions, but it's the biggest tank I can fit in my basement through the custom window. That's going to take a bit of convincing still (and a lot of saving) for my wife to buy in... Starting to get equipment now so the only sticker shock I have is the tank and sump.