I have a dogface in a 210. I would think that would be the minimum for adult size, depending on tank mates. Be sure to have a large skimmer and good water movement.
Mine seems to like having sand too. He does this thing where he "blows" in the sand looking for bristle worms or whatever else he can find. It's comical to watch.
I'm not sure of the full adult size (14"+?), someone else may be able to give that.