the setup at least looks cool, but one can bet the big fish were just put in there temporarily for a photo-op...who knows.
the sand motion toward the bottom would simulate something of a fluidized bed, which is cool, but is obviously more for looks here.
the fish is a platinum tropical gar...and as others have pointed out, it's NOT healthy. this is similar to the ones that died a couple years back, one of which we did a necropsy on and found massive fat bodies taking up most of the insides. i'm sure the owner hopes to keep it well fed, but really it's probably overfed/spoiled/just plain unhealthy. this leaves them open to idiopathic death issues and very likely overall shorter life-span.--
--solomon