Had me thinking about maybe digging a bigger pond when we move, LOL, but I can't imagine what it would cost to keep these guys fed properly! Not only that, but it limits pondmates too much, I think I'll stick with my Koi and goldies...
ETA: And in no way would I put a 4' fish of any kind in a 180gal tank, think about it, 180gal is what, maybe 18"-24" wide at the most... can't even turn around, not to mention the bio load of a messy large fish. I woulden't even consider putting one in my 220 if it were the only inhabitant...