It actually shows you how to do this in one of the game's tutorials. First, build an exhibit, then delete one wall, and attatch a tank to the empty side, and make sure the tank is at ground level. You know your animals get get to either one if you see the little stripy slanted edge on the tank like LEFTY said. Then add your show tank onto the other tank, lower it until the pass through gate appears, place the grandstands 1 tile away from the show tank, assign a marine specialist, and maybe add some toys and research tricks. :happy