That's a beautiful lungfish. I agree with guppy, you don't necessarily need a gigantic tank for that fish. In the wild, lungfish live in seasonal mud puddles. But if that were an african tigerfish, or some other active open water fish, it would be a real problem.
By the way, this is my first post on this site in about five years (back then, this place was called predatoryfish.net). I got into fishkeeping for about two years (1998-2000) and kept snakeheads, piranhas, wolffish, bichers, lungfish, you name it. Of course, I ended up trading and selling these fish when I took a break from the hobby, but in retrospect, I shouldn't have, for what do I find when I return? Snakeheads have been banned! I can't believe it. Some idiot had to ruin it for everyone.