I like a more minimalistic approach when aquascaping tankbuster tanks, I think the tank with the gars and knife has way too much crap in it for such large fish. I think they would fair alot better with less ornaments and more swimming space.
Took this picture of the 6 foot with the red hooks in today my old cat fish and his 2 mates standing to attention thought it was a cool picture considering it was taken with a phone. They know when there is food about.