I think if you are thinking about keeping this monster for life you will need a 3000 gal pond. Like most hobbiest who want to keep this cat they will never have a big enough tank for this fish. Why aren't you pro fish keepers talking about tank size like you do with the aros.
I am actually building a 5389.16 pond
This tank and the slightly upgraded one to come, are both just to buy me some time